# Masson Trichrome Staining – Principle, Procedure and Results > Masson trichrome staining explained: principle, reagents, procedure, collagen staining colors, fibrosis interpretation, and common troubleshooting problems. Canonical URL: https://biologynotesonline.com/masson-trichrome-staining/ Author: Sourav Pan Last updated: November 5, 2026 ![Masson Trichrome Staining – Principle, Procedure and Results](https://biologynotesonline.com/wp-content/uploads/2025/12/masson-trichrome-normal-liver-vs-fibrosis.webp) Masson trichrome staining or Masson's trichrome stain is a differential histological staining technique used to distinguish collagenous [connective tissue](https://biologynotesonline.com/connective-tissue-structure-location-function-and-classification/) from muscle and other tissue components. In this method, collagen fibers are stained blue with aniline blue or green with light green. The muscle fibers and cytoplasm are generally stained red, while the nuclei appear dark or black. Masson trichrome staining is used to examine the distribution and deposition of collagen in tissue sections. It is also used in the histological assessment of fibrosis, where increased collagen deposition may be observed. Collagen is also present in normal connective tissues. The presence of stained collagen alone does not confirm fibrosis. In this method, the tissue sections are first prepared, followed by nuclear staining and differential staining of the tissue components. The stained sections are then examined under a microscope. The staining result depends upon proper tissue preparation, the condition of the staining reagents and suitable differentiation conditions. ## Purpose of Masson Trichrome Staining ## Objectives of Masson Trichrome Staining The following are the objectives of Masson trichrome staining: - To demonstrate the presence of [collagen fibers](https://biologynotesonline.com/collagen-definition-structure-types-functions/) in histological tissue sections. - To differentiate collagenous connective tissue from muscle fibers and cytoplasm. - To examine the distribution and arrangement of collagen fibers in different tissues. - To detect increased collagen deposition during the histological assessment of fibrosis. - To study the formation and organization of collagen during wound healing and scar formation. - To compare the collagen deposition in normal and diseased tissues. - To examine changes in tissue structure due to the accumulation of fibrous connective tissue. - To estimate the area occupied by collagen in stained tissue sections using image analysis. ## Principle of Masson Trichrome Staining ![Three stages of Masson trichrome staining showing red dye removal from collagen during differentiation, followed by blue collagen and red muscle.](https://biologynotesonline.com/wp-content/uploads/2025/12/masson-trichrome-staining-principle-1024x341.webp)Differential staining of collagen and muscle during Masson trichrome staining. Phospho-acid treatment removes red staining from collagen, which subsequently takes up aniline blue. The principle of Masson trichrome staining is based on the different affinity of tissue components for acid dyes and their retention during differentiation. The acid dyes contain negatively charged dye ions which bind to positively charged groups present in tissue proteins. The nuclei are first stained with Weigert's iron hematoxylin. It stains the nuclei dark or black and is resistant to the acidic solutions used in the later steps. The tissue sections are then stained with Biebrich scarlet–acid fuchsin, which stains the muscle fibers, cytoplasm and collagen red. The sections are then treated with phosphomolybdic acid or phosphotungstic acid, or a mixture of both, for differentiation. These acids remove the red dye from collagen, while the muscle fibers and cytoplasm retain the red colour. Aniline blue is then used to stain the collagen fibers blue. Light green can also be used instead of aniline blue, which stains the collagen fibers green. The differential staining of collagen depends upon the affinity of the dyes, tissue permeability and displacement of the dye molecules. One explanation is that the larger dye molecules enter the more permeable collagen fibers and replace the smaller red dye molecules. Another explanation is based on the binding of phosphomolybdic or phosphotungstic acid to collagen, which affects the binding of the subsequent dye. The exact molecular mechanism of trichrome staining is not fully understood. ## Reagents and Materials Required for Masson Trichrome Staining The following are the materials and reagents required for Masson trichrome staining: ### Materials and Equipment - Glass slides and coverslips - Formalin-fixed, paraffin-embedded tissue sections - Slide racks - Coplin jars or staining dishes - Water bath or temperature-controlled oven - Light microscope - Measuring cylinders and pipettes - Glass beakers - Filter paper and funnel - Xylene or suitable deparaffinizing agent - Graded ethanol solutions - Synthetic mounting medium ### Staining Reagents - Bouin's solution - Weigert's iron hematoxylin solution A - Weigert's iron hematoxylin solution B - Biebrich scarlet–acid fuchsin solution - Phosphotungstic acid - Phosphomolybdic acid - Aniline blue solution or light green solution - 1% acetic acid solution - Distilled or deionized water - Ethanol and clearing agent ### Reagent Preparation and Staining Kits The following are the reagent compositions used for the laboratory preparation of Masson trichrome staining solutions using the aniline blue method: - Bouin's solution- It contains 1500 mL of saturated aqueous picric acid, 500 mL of formaldehyde solution and 100 mL of glacial acetic acid. It is used to improve the staining of tissue sections. The concentration of the formaldehyde stock is not specified in this formulation. A validated laboratory preparation or ready-made Bouin's solution should be used. - Weigert's iron hematoxylin solution A- Dissolve 5 g of hematoxylin in 500 mL of 95% ethanol. - Weigert's iron hematoxylin solution B- It contains 20 mL of 29% ferric chloride solution, 475 mL of distilled water and 5 mL of concentrated hydrochloric acid. Equal volumes of solutions A and B are mixed to prepare the working solution. It is used to stain the nuclei dark or black. The working solution remains stable for about 3–4 days under the specified conditions. - Biebrich scarlet–acid fuchsin solution- Mix 2.7 g of Biebrich scarlet, 0.3 g of acid fuchsin, 300 mL of distilled water and 3 mL of glacial acetic acid. The solution stains the muscle fibers, cytoplasm and collagen red before differentiation. - Phosphotungstic–phosphomolybdic acid solution- Dissolve 25 g of phosphotungstic acid and 25 g of phosphomolybdic acid in 1000 mL of distilled water. It is used to remove the red dye from collagen. The muscle fibers and cytoplasm retain the red colour. - Aniline blue solution- Dissolve 2.5 g of aniline blue in 100 mL of distilled water and add 1 mL of glacial acetic acid. It is used to stain collagen fibers blue. - Acetic acid solution- The 1% acetic acid solution is prepared using 10 mL of glacial acetic acid and 1000 mL of distilled water in this formulation. It is used after collagen staining to remove excess stain and improve the differentiation of tissue components. - Light green solution- Light green SF yellowish can be used instead of aniline blue to stain collagen fibers green. In this modification, 5% phosphotungstic acid is used in place of the combined phosphotungstic–phosphomolybdic acid solution. The light green solution is prepared according to the selected light green protocol, as the staining conditions are different. - Commercial Masson trichrome staining kits- Commercial kits contain premixed staining solutions. The Sigma-Aldrich HT15 kit contains Biebrich scarlet–acid fuchsin, phosphotungstic acid, phosphomolybdic acid and aniline blue solutions. Bouin's solution, Weigert's iron hematoxylin and other required materials are obtained separately. The working solutions are prepared using the dilution and mixing instructions supplied with the kit. The kit concentrations are not interchangeable with those of the laboratory-prepared solutions. ## Precautions of Masson Trichrome Staining The following are the precautions of Masson trichrome staining: - The tissue sections should be properly fixed and firmly attached to clean glass slides to prevent them from coming off during staining. - Remove the paraffin completely from the tissue sections and hydrate them before staining. - Use fresh or properly stored staining reagents. Check the solutions for any contamination, precipitates or deterioration before use. - Weigert's iron hematoxylin working solution should be prepared by mixing the two stock solutions in the correct proportion. Use the working solution within the stability period mentioned in the protocol. - The tissue sections should be treated with phosphotungstic or phosphomolybdic acid for the specified time. Excessive differentiation may remove the red dye from muscle fibers and other tissue components. - Maintain the correct staining time and concentration of aniline blue or light green. The differentiation conditions may vary with different staining formulations. - Follow the washing steps given in the selected protocol. In some methods, the sections are transferred directly from the phospho-acid solution to the collagen stain without washing. - The stained sections should be dehydrated using the specified alcohol changes. Excessive treatment with alcohol may remove the collagen stain. - A control tissue section containing collagen and muscle should be stained with each batch to check the staining result. - All tissue specimens should be handled as potentially infectious materials. Wear laboratory gloves, protective clothing and safety goggles during staining. - Bouin's solution contains formaldehyde and picric acid. Formaldehyde is carcinogenic, while picric acid is toxic and may become explosive when dry. Handle Bouin's solution in a chemical fume hood. - Picric acid must not be allowed to dry. Do not open or handle containers having dried picric acid crystals, especially around the cap. Contact the laboratory safety officer for proper handling. - Handle concentrated hydrochloric acid, glacial acetic acid and other corrosive reagents carefully. Avoid contact with the skin and eyes. - Ethanol and xylene are flammable solvents. Keep them away from flames, sparks and other sources of ignition. Xylene should be used in a properly ventilated area. - All staining solutions should be labelled with their names, concentrations and dates of preparation. Store the reagents under the recommended conditions. - Collect used Bouin's solution, staining dyes, acids and organic solvents in suitable waste containers. The chemical waste should be disposed of according to the institutional safety procedures. ## Procedure of Masson Trichrome Staining The procedure of Masson trichrome staining for formalin-fixed, paraffin-embedded tissue sections using the aniline blue method is given below: ![Sequential Masson trichrome staining workflow showing tissue preparation, Bouin](https://biologynotesonline.com/wp-content/uploads/2025/12/masson-trichrome-staining-procedure-1024x512.webp)Main steps of Masson trichrome staining using the aniline blue method. The tissue section undergoes nuclear staining, differential staining of collagen and muscle, and final mounting for microscopic examination. ### Preparation of Tissue Sections - Take the [formalin-fixed, paraffin-embedded tissue sections](https://biologynotesonline.com/histology/) mounted on clean glass slides. - Remove the paraffin using xylene and hydrate the sections through descending grades of alcohol to deionized water. - Place the slides in Bouin's solution at 56°C for 1 hour. - Allow the slides to cool in the same solution for 5–10 minutes. - Wash the sections under running tap water for about 5 minutes or until the yellow colour disappears. Rinse with deionized water. ### Nuclear and Cytoplasmic Staining - Prepare the working Weigert's iron hematoxylin solution by mixing equal volumes of stock solutions A and B. - Stain the sections with Weigert's iron hematoxylin for 10 minutes and rinse in distilled water. - Wash the slides under running tap water for 3 minutes, followed by a rinse in distilled water. - Transfer the slides to Biebrich scarlet–acid fuchsin solution for 15 minutes. The working solution contains 90 mL of 1% aqueous Biebrich scarlet, 10 mL of 1% aqueous acid fuchsin and 1 mL of glacial acetic acid. - Rinse the sections with distilled water to remove excess stain. ### Collagen Staining - Mix 20 mL of 2.5% aqueous phosphotungstic acid and 20 mL of 2.5% aqueous phosphomolybdic acid to prepare the working differentiation solution. - Place the slides in the phosphotungstic–phosphomolybdic acid solution for 15 minutes. - Transfer the sections directly to 2.5% aniline blue solution without washing. Stain for 10 minutes. - Rinse the sections with deionized water to remove excess aniline blue. - Treat the slides with 1% acetic acid solution for 1 minute. Discard the used solution. ### Dehydration and Mounting - Dehydrate the stained sections through graded alcohols. - Clear the sections in xylene. - Add a synthetic mounting medium and place coverslips over the tissue sections. Commercial Masson trichrome staining kits may have different reagent concentrations and staining times. In the Sigma-Aldrich HT15 standard procedure, the sections are treated with Bouin's solution at 56°C for 15 minutes. Weigert's iron hematoxylin, Biebrich scarlet–acid fuchsin, phosphotungstic–phosphomolybdic acid and aniline blue are then used for 5 minutes each. The sections are treated with 1% acetic acid for 2 minutes. The kit procedure should be followed separately without mixing its conditions with the laboratory-prepared method. ## Results and Interpretation of Masson Trichrome Staining ![Comparison of normal liver with limited blue collagen around portal structures and bridging fibrosis with thick blue collagen septa extending between portal regions.](https://biologynotesonline.com/wp-content/uploads/2025/12/masson-trichrome-normal-liver-vs-fibrosis-1024x725.webp)Masson trichrome staining of normal liver tissue and a representative bridging fibrosis pattern. Normal portal connective tissue contains collagen, while bridging fibrosis is characterized by collagen-rich septa extending between vascular regions. ### Observation The stained tissue sections are examined under a [light microscope](https://biologynotesonline.com/light-microscope-labeled-diagram-definition-principle-types/). The observations of Masson trichrome staining are as follows: Tissue ComponentExpected Staining ColorCollagen fibersBlue or greenMuscle fibersRedCytoplasmRed or pink-redNucleiBlack or dark blue-blackErythrocytesRed Collagen fibers appear blue when aniline blue is used and green when light green is used. The muscle fibers and cytoplasm are stained red, while the nuclei appear dark or black. ### Interpretation Masson trichrome staining is used to differentiate collagenous connective tissue from muscle fibers and other cellular components. The distribution, arrangement and amount of collagen in tissue sections can be examined by this staining method. Collagen is normally present in the connective tissues of different organs. An increase in collagen deposition may be associated with fibrosis. The presence of stained collagen alone does not confirm fibrosis. The interpretation depends upon the amount and location of collagen, the normal structure of the organ and other histological changes. The observations in different tissues are as follows: - Liver- In the normal liver, collagen is present in the portal tracts and around blood vessels. During liver fibrosis, increased collagen deposition may be seen around the sinusoids, in the portal areas and between different vascular structures. Fibrous bands connecting these areas are observed in bridging fibrosis. - Kidney- Collagen is also present in the normal connective tissue of the kidney. Increased collagen staining between the [renal tubules](https://biologynotesonline.com/kidney-structure-anatomy-urine-formation-acid-base-balance-and-function/) may indicate interstitial fibrosis. The distribution of collagen is examined along with the changes in the renal tubules and glomeruli. - Heart- In the normal heart, collagen is found between the cardiac muscle fibers and around blood vessels. In cardiac fibrosis, increased collagen deposition may be observed in these areas. Large areas of collagen staining may also be present in myocardial scar tissue. ## Troubleshooting Masson Trichrome Staining The following are the common problems of Masson trichrome staining, their possible causes and corrective measures: ProblemPossible CauseCorrective MeasureWeak or absent collagen stainingInsufficient Bouin's treatment, deteriorated aniline blue or light green solution, or excessive differentiation with acetic acid.Check the Bouin's treatment time and use fresh collagen staining solution. Reduce the acetic acid treatment if the collagen stain is being removed.Excessive red stainingProlonged staining with Biebrich scarlet–acid fuchsin or insufficient differentiation with phosphotungstic–phosphomolybdic acid.Reduce the red staining time or increase the phospho-acid differentiation time according to the selected protocol.Poor collagen–muscle contrastThe red dye is not completely removed from collagen due to insufficient phospho-acid differentiation.Use fresh phosphotungstic–phosphomolybdic acid solution and check the differentiation time. Transfer the sections directly to aniline blue without washing when required by the protocol.Faded staining coloursExcessive washing, prolonged acetic acid treatment or excessive dehydration with alcohol.Reduce the washing and acetic acid treatment time. Dehydrate the sections quickly through the specified alcohol changes, particularly when light green is used.Weak nuclear stainingOld Weigert's iron hematoxylin working solution, insufficient staining time or improper washing after nuclear staining.Prepare fresh Weigert's iron hematoxylin by mixing the two stock solutions. Check the nuclear staining time and wash the sections in running tap water as specified in the protocol.Uneven tissue stainingIncomplete deparaffinization, drying of tissue sections during staining, or precipitates present in the staining solutions.Remove the paraffin completely and keep the sections covered with staining solution. Filter or replace the staining reagents when precipitates are present. A control tissue section containing collagen and muscle should be stained with each batch. If the control section also shows poor staining, the reagents and staining conditions should be checked. The staining time, washing steps and differentiation conditions may vary between laboratory-prepared solutions and commercial Masson trichrome staining kits. The conditions given for the selected protocol should be followed. Masson trichrome staining is used to estimate the amount of collagen deposition in tissue sections by measuring the collagen-stained area. The collagen fibers are stained blue with aniline blue or green with light green. The stained areas are then measured using digital image analysis. ### Collagen Area Fraction Measurement Collagen area fraction refers to the percentage of tissue area occupied by collagen-positive staining. It is used in the histological assessment of fibrosis. In this method, the collagen-stained area is measured and divided by the total tissue area selected for analysis. The calculation is as follows: Collagen Area Fraction (%) = (Collagen-Stained Area / Total Analyzed Tissue Area) × 100 The total analyzed area includes the tissue present within the selected region of interest (ROI). The slide background, empty spaces and other areas not included in the analysis are excluded from the measurement. The measurement can be carried out for the entire tissue section or for a particular region. For example, collagen deposition in the kidney can be measured separately in the renal interstitium. The same tissue regions should be selected when comparing normal and fibrotic specimens. ### Digital Image Analysis ![Digital image-analysis workflow showing a Masson trichrome-stained tissue section, selected tissue region of interest, and blue collagen-positive segmentation for area measurement.](https://biologynotesonline.com/wp-content/uploads/2025/12/masson-trichrome-collagen-area-quantification-1024x437.webp)Collagen area fraction is measured by dividing the area occupied by collagen-positive staining by the total analyzed tissue area. Image analysis identifies the selected collagen regions while excluding slide background and other unwanted regions. ImageJ or Fiji software is used to measure the collagen-stained areas in tissue sections. Whole-slide scanners and other digital image analysis software can also be used for this measurement. The procedure for digital image analysis of Masson trichrome-stained sections is given below: - Examine the stained tissue sections under a light microscope and take digital images at the selected magnification. - Use the same microscope settings, illumination and image resolution for all the tissue sections being compared. - Open the images in ImageJ or other image analysis software. - Select the region of interest (ROI) containing the tissue to be measured. The slide background and other unwanted areas are excluded from the analysis. - The blue or green collagen-stained areas are separated from the other tissue components using colour thresholding or colour deconvolution. - Adjust the colour threshold to select the collagen-positive areas. The surrounding muscle fibers, cytoplasm and background should not be included. Use the same validated threshold for comparable images. - Measure the area occupied by collagen using the area measurement function. The total tissue area is also measured. - Calculate the percentage of collagen-stained area from the total analyzed tissue area. - Take measurements from different microscopic fields or tissue sections. The average collagen area fraction is then calculated for each specimen. ### Interpretation and Limitations of Quantitative Results The following are the limitations and important points regarding the interpretation of collagen quantification: - An increase in collagen area fraction may indicate increased collagen deposition in the tissue. It is used to compare the extent of fibrosis in normal and affected specimens. - Collagen is also present in normal connective tissues. The amount and distribution of collagen differ between organs and even within the same organ. The normal collagen-containing areas must be considered during interpretation. - The staining result depends upon tissue fixation, section thickness, staining reagents and differentiation conditions. Differences between staining batches may affect the measurement of collagen-positive areas. - The selection of colour threshold affects the measurement. A low threshold may include areas without collagen, while a high threshold may exclude weakly stained collagen fibers. - The same staining and image acquisition conditions should be used for the specimens being compared. Control tissue sections are used to check the differences in staining between batches. - Collagen area fraction represents the proportion of tissue occupied by collagen-positive staining. It does not measure the absolute mass or concentration of collagen in the tissue. - The optical density of collagen staining depends upon the amount of dye retained, tissue section thickness and staining conditions. Darker staining does not always indicate a greater amount of collagen. - The result also depends upon the selection of tissue regions. Some microscopic fields may contain more collagen than others. Multiple representative fields or tissue sections should be examined when required. - Masson trichrome staining does not differentiate between the different types of collagen. Biochemical methods such as hydroxyproline estimation may be used to measure collagen content independently of the stained area. ## Applications of Masson Trichrome Staining The following are the applications of Masson trichrome staining: - It is used to demonstrate collagen fibers in histological tissue sections. - To differentiate collagenous connective tissue from muscle fibers and other cellular components. - It is used to examine the distribution and arrangement of collagen fibers in normal and diseased tissues. - Masson trichrome staining is used to detect increased collagen deposition in different organs during fibrosis. - It is used in liver biopsies to examine the extent and distribution of fibrosis in chronic liver diseases, including cirrhosis. - To study interstitial fibrosis in kidney tissue by examining collagen deposition between the renal tubules. - It is used to detect collagen deposition in cardiac muscle during myocardial fibrosis. The fibrous scar tissue can also be examined. - It is used to examine fibrotic changes in lung tissue. - To detect increased connective tissue deposition between skeletal muscle fibers in muscle fibrosis. - It is used to study collagen deposition during wound healing and scar formation. - It is used to differentiate collagenous connective tissue from [smooth muscle](https://biologynotesonline.com/muscular-tissue-definition-characteristics-structure-types-functions/) in certain tumors. - The collagen-stained area can be measured using digital image analysis to estimate the extent of fibrosis in tissue sections. ## Advantages of Masson Trichrome Staining The following are the advantages of Masson trichrome staining: - It is used to differentiate collagen fibers from muscle fibers and cytoplasm in histological tissue sections. - Collagen fibers are stained blue or green, while muscle fibers are stained red. These differences can be easily observed under a light microscope. - The nuclei, collagen fibers, muscle fibers and erythrocytes can be examined in the same tissue section. - It is used to examine the distribution and arrangement of collagen fibers in normal connective tissues. - Increased collagen deposition can be detected in tissues affected by fibrosis. - It helps in the examination of fibrous scar tissue formed during wound healing and tissue repair. - Formalin-fixed, paraffin-embedded tissue sections can be used for staining. - The stained tissue sections can be examined using an ordinary light microscope without the need for fluorescence microscopy. - The collagen-stained area can be measured using digital image analysis to estimate the collagen area fraction in tissue sections. - Aniline blue or light green can be used for staining collagen fibers depending upon the selected staining method. ## Limitations of Masson Trichrome Staining The following are the limitations of Masson trichrome staining: - Masson trichrome staining cannot distinguish between different types of collagen, such as type I and type III. - Very thin collagen fibres may not be stained clearly. This may result in an underestimation of the collagen content in the tissue. - The staining of collagen is affected by the type of fixative used. Some fixatives may produce weak staining of fine collagen fibres. - The intensity of staining depends on the concentration of reagents and the time used for differentiation. - The amount of collagen cannot be measured accurately by visual examination alone. Quantitative measurement requires standardized staining conditions and image analysis. - Elastic fibres and fine reticular fibres may not be clearly demonstrated by this staining method. - The thickness of tissue sections can affect the staining results. Sections of different thicknesses may show differences in staining intensity. - The staining results may vary between different batches due to changes in reagent concentrations and staining conditions. ## References - Baidoo, N., Sanger, G. J., & Belai, A. (2023). 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