I take it Bob that cling film ensured the developer was good for the next night's developing?
If it was then it sounds like a cheap solution for a 24 hour extension
The only way to increase developer life in trays that I have read about is to use the one stocked by the Photographer's Formulary in the U.S. called Liquidol
This is the famous paper developer devised apparently by Ron Mowrey a long time Kodak chemist whose death was announced
on Photrio about a week ago
Mike
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