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Ansco 210 Acid Short-stop Bath (Stop Bath)

FormulasThis solution is recommended for use between developer and fixer, to prevent staining of film negatives, radiographs, prints, etc. Agitate negatives or prints for at least 5 seconds in this bath before transferring to fixing solution.


Acetic Acid (28%) 45 ml
Water 1 L


Glacial acetic acid (99.1%) may be diluted to the 28% concentration by mixing three parts of glacial acetic acid with eight parts of water.


From Ansco Formulas for Black and White Film by GAF, 1948 – Formulas are provided for historical reference. They may not work well with modern films and papers. Some of the chemicals can be dangerous. As with all photographic processes, be careful.