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Hypo eliminator HE-1 (not recommended for film)
(Source : Basic Photography - Michael Langford)

Water 500 ml
Hydrogen peroxide (3%) 125 ml
Ammonia (3%) 100 ml
Water to 1 litre

For 3% ammonia solution add 2 parts ammonia 28% to 9 parts water.

Treatment time ~ 6 mins.