I'm not scientifically inclined so please be patient with me!
I make home-made soap with lye. I bought some drain cleaner which said 100% lye on the bottle. I've made many soaps with this but recently got suspicious when other soapmakers said their bottles of this particular brand of lye was pure white - mine was grayish and had bits of 'junk' in it.
I wrote the company and they told me it was 100% lye and nothing else. Today I bought some more, opened the bottle and found it was TOTALLY DIFFERENT from those last bottles I bought earlier.
From what I can gather in internet searches, this company used to sell this drain cleaner with other ingredients added but changed to 100% lye when Red Devil Lye was no longer available. I'm sure what I had was the old stuff and they mislabeled it.
Of course, I wrote the company but haven't heard back yet and I'm not even sure they'll be honest with me. Where can I find the MSDS for this stuff? I arrived here doing an internet search for it. If I can't get the MSDS, how else can I find out what was in those bottles (I have some left)?