VitroView™ Martius Scarlet Blue (MSB) Stain Kit


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SKU: VB-3036 Category:


The Martius Scarlet Blue (MSB) technique proves to be a dependable approach for distinguishing between fresh and aged fibrin clusters. It achieves this differentiation by employing Martius Yellow, which selectively stains erythrocytes and early fibrin deposits. The staining process involves the utilization of dyes of varying molecular sizes: Crystal Scarlet, a medium-sized molecule dye, and larger molecule dyes like Phosphotungstic Acid and Aniline Blue. This trichrome-type staining results in red-colored fibrin and muscle tissues. On the other hand, collagen and older fibrin clusters take on a blue hue.

The Martius Scarlet Blue (MSB) staining method serves as a valuable tool for visualizing fibrin, particularly the older clusters. The associated stain kit is designed to facilitate the histological demonstration of fibrin, muscle, collagen, and erythrocytes.

Kit Components

Sku# Reagent Name Volume (ml)
VB-3036-1 Bouin’s solution 250 ml
VB-3036-2 Weigert’s Hematoxylin Solution A 125 ml
VB-3036-3 Weigert’s Hematoxylin Solution B 125 ml
VB-3036-4 Martius Yellow Solution 250 ml
VB-3036-5 Biebrich Scarlet-Acid Fuchsin Solution 250 ml
VB-3036-6 Phosphomolybdic-Phosphotungstic Acid Solution 250 ml
VB-3036-7 Aniline Blue Solution 250 ml
VB-3036-8 1 % acetic acid solution 250 ml



Store at room temperature.


  1. Deparaffinize in xylene (6 minutes) ×2
  2. Rehydrate:
    • Ethanol 100% (2 minutes)×2
    • Ethanol 95% (2 minutes) ×2
    • Ethanol 70% (2 minutes) ×1
    • Rinse in distilled water (2 minutes) ×

3. Mordant in Bouin’s Solution, 60°C for 1 hour.

4. Wash in running tap water for 5 minutes to remove the picric acid.

5. Prepare Weigert’s working hematoxylin: mix Weigert’s Hematoxylin Solution A and B at 1:1 ratio.

6. Weigert’s working hematoxylin for 10 minutes.  Note: Discard after use.

7. Blue in running tap water for 5 minutes, rinse once for 1 min in distilled water.

8. Apply Martius Yellow Solution for 2-3 minutes.

9. Rinse slides with distilled water.

10 .Biebrich Scarlet-Acid Fuchsin Solution for 5 minutes.

Note: Solution may be used twice only, and then discarded.

11. Rinse once for 1 min in distilled water.

12. Phosphotungstic/phosphomolybdic acid solution for 10 minutes, discard solution.

13.Transfer directly into Aniline Blue Solution for 3 minutes.

14. Acetic Acid Solution for 2 seconds, discards solution.

15. Dehydrate with 2 dip of 95% Ethanol and 2 changes of 100% Ethanol (2 minutes per change).

16. Clear with 3 changes of xylene (5 minutes per change) and coverslip with Permount or other suitable organic mounting medium.

Control Tissue: Blood clot (thrombus) or lung.

Expected Results:

  • Nuclei – blue/black
  • Muscles – dark red
  • Fibrins – red (young clusters may be stained yellow, and older ones blue)
  • Collagen – blue
  • Erythrocytes – yellow


Fitzgerald ST, et al (2019). Platelet-rich clots as identified by Martius Scarlet Blue staining are isodense on NCCT. J Neurointerv Surg. 11(11):1145-1149


This product is intended for research purposes only. This product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.


Handle with care. Avoid contact with eyes, skin and clothing. Do not ingest. Wear gloves.

More Images

Mouse Blood Clot, MSB staining, 4x
Mouse Blood Clot, MSB staining, 10x
Mouse Blood Clot, MSB staining, 20x
Mouse Blood Clot, MSB staining, 20x

User Manual and Material Safety Data Sheet (MSDS)  (PDF)

VB-3036 User Manual

VB-3036 MSDS