"Really, I’m surprised at you, Tom! The fall from a tank like that will be equivalent to an average week’s rainfall.  But the point of the idea is the composition.  I’ve tried other preparations without success, but this stuff of mine sets hard and yet melts easily.  By varying the proportions of the ingredients you can get it to melt at different temperatures, but I haven’t quite finished my experiments in that direction.  The difficulty is to gauge the exact temperature required, but I’ll manage it before long."