To use as a stop bath it must be white or distilled vinegar. The brown form may stain. Check the label as it can be any percentage from 4% to 5% depending on the brand. Kodak SB-1 for papers is 2% acetic acid, for films the percentage can be 1%. So if you have the 4% version dilute it with an equal amount of water for 2%. Jerry ________________________________ From: Bogdan <bkarasek@xxxxxxxxxxxx> To: pure-silver@xxxxxxxxxxxxx Sent: Fri, February 25, 2011 2:56:37 PM Subject: [pure-silver] Using diluted vinegar as stop bath Hello all, this was discussed a few years back, but do not remember the details. I have 3 gallons of kitchen vinegar and I remember it was mentioned that a dilution of vinegar could be used as a stop bath. Does anybody know what dilution of vinegar to water I should use? Are there any disadvantages to using diluted vinegar as opposed to the Indicator Stop made by the great yellow Father or Ilford's Stop bath? If I do use diluted vinegar, how can I tell when I should dump the bath? Cheers, Bogdan