One more cautionary note to add to Jim's reasonably careful comments...
It can get surprisingly hot when you add the crystals to water. Heat of dissolution isn't a phenomenon most folks are expecting. Don't use a thin plastic container to dissolve the lye in. Just in case you add more than you meant to. I remember a great chem lab demonstration. The water foamed right up and splashed around the counter top. Great low budget evil-spirit-movie special effect.
Pure lye has been pulled from a lot of store shelves recently. Lawsuitaphobia.
It can get surprisingly hot when you add the crystals to water. Heat of dissolution isn't a phenomenon most folks are expecting. Don't use a thin plastic container to dissolve the lye in. Just in case you add more than you meant to. I remember a great chem lab demonstration. The water foamed right up and splashed around the counter top. Great low budget evil-spirit-movie special effect.
Pure lye has been pulled from a lot of store shelves recently. Lawsuitaphobia.