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Response to higher acutance variant of divided d- 76 ?

from Ryuji Suzuki (rsuzuki@rs.cncdsl.com)
Pete, maybe we should reserve the name D-76 as published by EKC and should use different name for all its modification including no hydroquinone version because omitting hydroquinone is very against the design concept of D-76.

By the way, D-96A mentioned in Troop's book sounds pretty good, but I cannot find it published in EKC literature... maybe I'm not looking at the right place. I know the HQ version, original D-96 is published everywhere...

Ted, I think divided formula has to pay attention to let the negative swell and absorb enough chemical in bath A by adjusting the pH just about neutral or slightly higher. In split stock practive, bath A is usually maintained as acidic as possible. Gelatin swelling is minimised around pH of 5, and gradually increases to moderate pH range (comparable to D-76 or 9) and more sharply increases above that or below 5, in typical plots I've seen. (I've never measured myself)

(posted 8058 days ago)

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