Originally Posted by
Steve Goldstein
You can use supermarket distilled white vinegar to mix up a stop bath that will work exactly the same as the stuff you used to make by diluting glacial acetic acid. The stuff they sell in the market is usually about 5% acidity, while "real" stop bath is around 1.4%. So take 1 volume (quart, liter, or flagon) of vinegar and mix with 2.5 volumes of water and you'll be close enough. The exact level of acidity isn't critical, and it changes with use in any case.
This mixture will have the same drawback as stop made by diluting glacial acetic acid - it won't turn blue as it gets depleted. If you knew what Kodak uses as an indicator you could add it (if you can get it) to get back the yellow/blue feature.
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