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Old 14th July 2013, 04:29 PM
JOReynolds JOReynolds is offline
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Location: St Albans UK/Agde France
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Default Stale C41

Mixed C41 developer will oxidise at a rate defined by the storage conditions, which could make it either usable or worthless. Its colour is a good indicator - the paler the better. The CD4 component, unmixed, is preserved in sulphurous acid and lasts well. The other components do not age significantly. The Ferric EDTA bleach concentrate may crystallise but may redissolve on gentle warming, but then filter it to be safe. The fix and stabiliser do not deteriorate.
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