Re: saffron and humidity - re-submitted
Patrick Paulusse at Pembroke General Hospital in Ontario, Canada writes
I am running an HPS stain as my routine stain on a Leica Autostainer.<< He
has a trouble-shooting problem that I can't offer any advice about.
I didn't know that the HPS (hematoxylin-phloxine-saffron Masson trichrome)
stain was still in use as a routine stain anywhere. The stain originated in
Canada - in Montreal, I think - and was in use at Columbia University in NYC in
the 1960's. It is used as a general oversight stain, instead of H & E - many
pathologists favored this approach in the 1930's, including Chandler Foote at New
York Hospital (Cornell University Medical Center) in NYC.
Saffron (not safranin) is a natural dye also used as a spice - it flavors
paella, for instance. It's extremely expensive, and (unless it's come along
recently) there is no synthetic substitute for it. (It's prepared from the flowers
- specifically the pistils - of Crocus sativus and is grown in Spain and the
Middle East - Penzey's offers a wide selection of saffrons.) For histologic
use, the dye is extracted in alcohol - some methods specify prolonged boiling of
the dye in alcohol, using a reflux condenser.
Patrick Paulusse, would you bring us up to date on this interesting old
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