| http://www.w3.org/ns/prov#value | - The addition of cleaning agents that contain strong acids or oxidizing agents (e.g. chlorine-containing bleaches) to thiocyanate-containing photoprocessing solutions (e.g. some fixers) may release poisonous and flammable hydrogen cyanide gas, as well as other irritating and toxic gases such as cyanogen chloride and sulfur dioxide.
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