EDTA

Terry King (101522.2625@compuserve.com)
Thu, 30 Jan 1997 18:04:34 -0500

Message text written by Richard Sullivan
>Ferric acetate appears to be one of these, and it is
generated by the use of acetate developers that have small quantities of
free acetic acid. Normal darkroom fix or hypo will stain prints yellow,
probably due to the sulfur (sulphur to you Terry). <

That was very useful and has been carefully filed.

The yellow can arise even if you use a dish that has been used for fixing
with hypo and thoroughly washed afterwards.

Moral : keep separate dishes for Pt/Pd.

Last year somebody on the list mentioned another reason for Pt/Pd prints
going yellow but I cannot remember what it was.

Terry King