I'm returning to the dihydrobenzene version of the Catechol developer from the raw substrate. In England it is available as the Part A pyrocatechol and part B Sodium Metaborate (Kodalk) raw material.
My notes from 2008 indicate that I was using a 1:5:100 ratio as Part A: Part B: Water. I've scribbled citric acid in but no idea why.
Returning to using this developer again, I can't remember at all how to make the solution of Part A or B up.
There are various internet suggestions for Sandy King's Pyro HD; Ansel Adams' version but none for the UK version which I can find.
I'm guessing, that Part A was constituted by 25gram Pyrocatechol; Part B as 25g, each in 100ml distilled water.
Can anyone who uses pyro confirm the stock mix ratios for the Part A & B?
It must be a really simple issue but it has been a long time since and I've no recollection.
Kind regards,
RJ
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