Post by Kevrob Post by Lynn McGuire
Hagar the Horrible: expired soap ?
Wouldn't soap made from animal fat as in Hagar's age
only last so long? Fat can spoil.
/digs into old memories of high-school chemistry
Yes, fat can go rancid. And under some circumstances you want it
to; IIRC if you want a hard bar of soap you need rancid fats.
Fresh fats will make soft soap. OTOH once the fat has been
subjected to alkali (lye, e.g.) and heat, it's possible the fat
has been sufficiently denatured that it won't go rancid. At
least, not nearly as soon. But my high-school chemistry class
was sixty years ago.......
Dorothy J. Heydt
djheydt at gmail dot com