Sandy

Another Patrick post - I think this was the one I had in my mind:

"I can tell you that phenidone, hydroquinone, catechol, pyrogallol and
ascorbic acid are soluble in alcohols. Be bold. Make a split stock A
solution of phenidone-hydroquinone, phenidone-pyro or
phenidone-catechol. Do not use any sulfite in this solution. In fact, if
you do not use any sulfite in the working solution, you may learn
something about the relationship between sulfite and granularity that
you did not know before. You will also find out that hydroquinone is in
the same class as catechol as a staining-tanning developer. You can
borrow the Pyrocat-HD formula, but leave out bromide and sulfite."

Jorge O