Pasini's Trichrome
for Elastic and Collagen


Ehrlich's alum hematoxylin
Solution A
Phosphotungstic acid 2 g
Distilled water 100 mL
Solution B – Var I
Eosin B 0.7 g
Acid fuchsin, sat. aqu. 4 mL
Unna's elastic stain 35 mL
Glycerol 40 mL
Ethanol, 50% 35 mL
Solution B – Var II
Eosin B, 2% in 50% ethanol 30 mL
Acid fuchsin, sat. aqu. 4 mL
Unna's elastic stain 30 mL
Glycerol 15 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. Stain nuclei with an alum hematoxylin nuclear stain.
  3. Place into solution A for 10 minute.
  4. Rinse quickly with distilled water.
  5. Place into solution B for 15-20 minutes.
  6. Rinse quickly with 70% ethanol.
  7. Dehydrate and differentiate with 100% ethanol for a few seconds.
  8. Clear with xylene and mount with a resinous medium.

Expected results


  1. Solution B var I was given by Gray, var II was given by Gatenby & Beams.


Gray, Peter. (1954)
The Microtomist's Formulary and Guide.
Originally published by:– The Blakiston Co.
Republished by:– Robert E. Krieger Publishing Co.
    Gatenby, J. B. & Cowdry, E. V., (1928)
    Bolles Lee's Microtomist's Vade Mecum, pp. 280
    Blakiston, Philadelphia

Bolles Lee, A.. Edited by Gatenby, J.B. and Beams, H.W., (1950)
The Microtomist's Vade-Mecum. 11 ed., pp. 485
Churchill, London, UK.




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