Many thanks for the chart DJ. It seems to spell it out. I am pleased to see that mushrooms are not quiet as evil as my wife makes out. But if I understand this chart correctly then I need to drink the juice of 60 lemons to neutralise 1 coffee? (20 parts of alkalinity to 1 part of acidity (x3)). There must be an acid buffer somewhere in the formula I guess – pass me the bicarbonate of soda,