Quote, a good one, " " Also it's not staff splashing it about that's the problem - I always make sure bottles go out almost empty because pupils don't seem to know difference between "a few drops" and "a good splash" """ got me remembering. In a previous existence we used smaller bottles because when a recipe says to use 50 ml and they got a 250 ml bottle, it always came back half empty, ditto for a recipe asking for 10 drops. We trialled sending out small amounts in the bottles and got complaints that there was not enough stuff for the experiments. Then we sent out the stuffs in 125 ml bottles and they came back the same, half empty, but no complaints. Cut our stock solutions usage by near half -- -- -- Result !