Response to Chemical Mixtures

Hi Colleen, This is very dependant upon the type of developer you have bought. Some like Agfa Rodinal tend to be quite easy to make just enough for a single roll where as others like Ilford ID-11 need to first be mixed using the whole package into what they call a "Stock Solution". You then can use a portion of the "Stock Solution + water" to make a one-shot solution you can discard. With stop bath it is just as easy to make a container full and reuse as it does not expire from sitting around but only from using it over and over. (at least it takes a very long time for it to expire if unused) As for fixer most folks also make a quantity that they keep and reuse. Fixer also has a life that is measured in how much film you develope and not so much on how old it is. Hope this helps.

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