Cling Film.
Lik Bob, I too use clingfilm but not on B&W. I should have mentioned that if I leave it overnight to continue the following day, I pour the developer back into a 2 litre bottle I have kept for that purpose.
Plastic is not a good insulator preventing oxidisation but it is a very good way of preventing the water content from evaporating. I have used it for very nearly 30 years with colour developer in a Nova Processor. (As well as the tubular lids.)What I find happens is, as the chemicals cool, a slight vacuum is created when the chemicals cool and loose volume. The clingfilm must be wrapped around the top and pressed into the corners to make a good seal.
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