Update: I found a neutralizer kit on the net and the MSDS sheet seems to say that it contains diluted NaOH, indicator sticks, and little else. Personally, I would use sodium bicarbonate (baking soda) and gypsum. Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist