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buffered stop bath (replenishable)

acetic acid, 90% 20ml
sodium acetate 80g
water to make 1.0 liter
target pH 5.0 plus/minus 0.5

same thing can be made this way:
acetic acid, 90% 60ml
sodium hydroxide 25g
water to make 1.0 liter
target pH 5.0 p/m 0.5

Either bath can...
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Ryuji
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