[pure-silver] Re: Fishy developer: NOW Triethanolamine
- From: "John Black" <jblack@xxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 17 Dec 2004 16:38:56 -0500
>
> It appears that Pat Gainer has updated his formula to contain 0.2 g of
potassium
> bromide per 100 ml of concentrate. This small amount reduces fog
experienced
> with some films such as 400Tmax.
Good. Gainer's has needed something to reduce fog in some of his formulas as
they use high pH as a substitute for sulfite.
>
> Hydroquinone is readily soluble in both TEA and propylene glycol.
I may give this a try since I cannot get any more ascorbic acid into the
methanol. I made up some of Gainer's PC-TEA last summer and it still works
fine but is dark as coffee. This is just PC and TEA, no glycol or meoh.
Incedintally, I store the Tris/borate as a 5X solution B with 25gm sulfite
per liter. I recently found that the sulfite at that level slowly craps out
over 4-6 months and needs to be refreshed. I think I will use some
metabisulfite in the next batch to help stabilize the sulfite.
The PC in meoh, however, is still fully active after 5 months in the dark in
a half filled bottle at room temp.
JB
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