Ponceau refers to poppies ot the red color of poppies - not the
orange "poppyseed" poppies but the redder variety. (In the US,
people wear paper "poppies" of this color on Veterans Day).
There are many dyes with the word ponceau in their name and
consequently much confusion in the histological literature as to
which is called for in a particular stain. Always refer to the CI
number when ordering to avoid a serious mistake, as the commercially
available ponceau dyes certainly are not interchangeable. Ponceau de
xylidine is probably the most famous, as it was used in some of the
original trichromes. It's exact identity is unknown (and quite
possibly no longer made); ponceau 2R (CI 16150) is thought to be the
most likely equivalent.
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