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This is 1lb of Sodium Metaborate from Photographers' Formulary. It is used as a mild alkali accelerator in developers with moderate to high alkalinity, and also helps to avoid the creation of gas when it comes in contact with an acid.
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Kodak balanced alkali Kodalk
White crystals An ammonia-like odor
As a mild alkali accelerator in developers of moderate to high alkalinity. Used to avoid the creation of gas when it comes in contact with an acid. For this reason the possibility of blister formation is minimized.