I'm so predictable
There is an infinite number of discussions, which soap ingredients to call “natural” and which not. Have the fun and search SMF for threads. It always boils down to
opinions rather than
facts. You don't
find out if an ingredient is natural, but you
decide. Those who are selling, carry the extra burden that they have to anticipate the state of knowledge/cultural imprint of their potential customers.
The particular discussion, that I guess
@Zany_in_CO is referring to, was a few weeks ago specifically about the “natural” label for propylene glycol (that is systematic named
1,2-propanediol, btw.!), and if
1,3-propanediol is a worthy substitution in M&P soap:
Both denatured alcohol and propylene glycol are in a class of chemicals called alcohols. As others have said, denatured alcohol is ethyl alcohol plus something that we can not drink (often acetone or methanol) This is so that it is not taxed as drinking alcohol. Clear soaps can be made with...
www.soapmakingforum.com
It seems that there is currently some semi-knowledge about M&P solvents circulating in the interwebz. It might well be that someone wants to sell 1,3-propanediol, and attempts to justify its price premium by spreading viral FUD marketing. Or just another short-lived alarmism hype from someone who wants to collect YouTube/Facebook clicks, without caring about the things themselves.
Decide yourself if you want to follow such flashs-in-the-pan, or rather gather a balanced perspective on this topic. 1,2-propanediol is being
made from glycerol too, not only from natural gas, as do companies produce 1,3-propanediol from fossil sources. Replacing 1,2-propanediol by 1,3-propanediol for health reasons is premature at best, as long as the toxicology of 1,3-propanediol isn't proven to be superior to that of 1,2-propanediol.
For M&P, you could also just use glycerol itself, which makes an excellent M&P solvent, and you don't even need any chemical/enzymatic/fermentation modification at all.
Do you want your soap to be
clear, or
clear and remeltable? There are several clear and non-remeltable recipes out there, that are on par with lye-soap M&P in terms of clarity, but need less solvents, or none at all.