Response to Chemical Mixtures

Chemistry must always come with an instruction leaflet, so read this first! If nothing else is specified, ratios of liquids (1+4 in your case) are given in terms of volumes (not masses) to be mixed (because measuring volumes is so much easier). So if your tank needs say 250 ml to develop one 35-mm film (the quantity of solution needed is specified in the instructions of the tank, or even on the tank), one part is 250 ml divided by 5 (1+4), thus 50 ml. Add four parts, 200 ml, of water to get 250 ml.

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