stop bath


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stop bath

[′stäp ‚bath]
(graphic arts)
When a negative or print is removed from the developer, it is usually placed in a stop bath to halt the action of the developer immediately; a common stop bath is a solution of 2 to 5% acetic or citric acid, or potassium metabisulfite.
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The rule of thumb of the industry is that 1.2 ounces of developer and 6/10 of an ounce of both stop bath and fixer are required for a beautiful mantle-bound 8x10 glossy, 8/10 and 4/10 for a 5x7, and about 4/10 and 2/10 for each wallet photo and proof print.
Ben Sturnham's early red card did not stop Bath running riot.
When you've accumulated enough pieces of photo paper for everyone, you're ready to assemble the following as well: four trays, developer, stop bath and fixer, watercolor brushes or cotton swabs, tongs and running water.
Before the real fun begins, discuss with the class the purpose of paper developer, stop bath, fixer and the water wash.
STOP BATH RUNNING: London Irish's Chris Sheasby holds up James Scaysbrook
Stop baths and fixers also warrant extreme caution when used, and should never be handled casually.