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Hypo Clearing Agent
Solutions of a wide variety of inorganic salts used as an intermediary bath between washing and fixing will speed up the wash by improving its efficiency. Hypo clearing agents are a cocktail of the most effective salts, and are most useful with fibre-based papers, where fixing agents are most difficult to clear from the base material. Not really worth bothering with in the case of film and RC papers, which wash quickly in any case. The old Kodak product is the favourite, supplied in powder and making 19 litres of working solution (3.8 litres of stock solution). All the others are liquid stock solutions. Chemically quite benign, no special precautions needed.
Popular hypo clearing agent in an economical powder pack that makes 1 US Gallon (3.8 litres) which then dilutes 1 + 4. It dissolves easily.
ILFORD WASHAID is a hypo-eliminator formulated to aid the efficient removal of the thiosulphate by-products of fixation by ion exchange. It is particularly useful in speeding up the washing of fibre based papers and is designed to be used with the ILFORD optimum permanence sequences. It can be used to aid the rapid washing of all ILFORD films and fibre papers saving both time and water. It is particularly useful if a hardening fixer has been used. INFO: Ilford Chemical Sundries PDF
WA50 is specifically designed to speed the removal of fixing agents from the fibres of BW fibre based printing papers. Used in conjunction with a running water wash WA50 will cut washing time to around 20 minutes. Dilutes 1+9 to make the volume required.
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