Sweat, Meloan & Puchtler's
One Step Trichrome


Solution A
Chromotrope 2R 0.6 g
Aniline blue 0.6 g
Phosphomolybdic acid 1 g
Hydrochloric acid, conc. 1 mL
Distilled water 100 mL
Solution B
Acetic acid, glacial 1 mL
Distilled water 100 mL

Tissue sample
5µ paraffin sections of neutral buffered formalin fixed tissue are suitable. Other fixatives are likely to be satisfactory. Most trichrome stains benefit from picric acid or mercuric chloride fixation. Formalin fixed tissues may benefit from secondary fixation of sections in Bouin's fluid.


  1. Bring sections to water via xylene and ethanol.
  2. Place in Bouin's fixative at 56°C for one hour.
  3. Wash with running tap water 3 to 4 minutes to remove yellow.
  4. Place into solution A for 1 minute.
  5. Rinse with solution B for 30 seconds.
  6. Dehydrate rapidly with ethanol.
  7. Clear with xylene and mount with a resinous medium.

Expected results


  1. A nuclear stain is not used as the hydrochloric acid will remove it.



Culling, C.F.A., Alison, R.T. and Barr, W.T. (1985)
Cellular Pathology Technique, 4th ed.
Butterworths, London, UK.




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