I just have a question about making PCBs. I live in china and am presently studying electronics. I read a couple of tutorials about making PCBs and have gathered all the things to make it. However the Ferric Chloride is not liquid but a bunch of blocks. My question is 1. Is it safe to mix the chemicals at home 2. Besides Ferric Chloride what do I add to make the etching solution and what is the ratio of the ingredients. Thank you so much for helping me