Picric acid (saturated aqueous soln.,
1.22%)
9.1 g Picric acid in 750 ml. H2O
750.0 ml
Formalin, full strength (37-40% by
volume)
250.0 ml
Glacial Acetic Acid
50.0 ml
________
1050.0 ml
Note: excellent penetration; especially good for young tissue;
fix 4-18 hours -no longer; must be washed out of tissue, usually by 10%
formalin, or it will interfere with staining.