I'm new to soaping and have read that you should test the PH of your soaps. A lot of what I've read on this site mentions the 'zap' test. What is that and how do you perform it? I also read about some chemical (can't remember the name now but I think it started with a 'T') was also useful in determining PH. Also, I'm of the impression that an ideal PH is around 9. Is that correct? Any input is welcome!!!