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 SEE ON AMAZON   Click SEE ON AMAZON for Updated Price. Estimated Price: 13.95$13.95$ Formulary's Hype Clear Agent aids in the archival process, based upon ion exchange: ions absorbed onto a solid film or paper can be replaced by ions of a solution such as those found in the Hypo Clear solution. The net effect is that the absorbed thiosulfate ions of the hypo (difficult to … [Read more...] about Photographers’ Formulary Hypo Clear Agent for Black and White Film/Paper, Makes 2.5 Gal Working Solution