So, it turns out that almost all the oils I use for soaping are available kosher, BUT they only come in much smaller batches -- a few ounces, maybe a pound at most -- and they charge the earth for them. $15 for 4 ounces of castor oil, $10 for 16 ounces of coconut oil on a good day, and so on. Soybean oil is inexpensive, even kosher, but the things I would want to add to it to make a reasonably hard, reasonably bubbly, no-DOS bar of soap will far outweigh the cost savings of the soybean oil.
I have only one concern with soap made purely of olive oil: how to get it to be bubbly without adding coconut, which is expensive, and to which an alarming number of my friends are allergic? I hear that both milk and various sugars (honey, table sugar, and so on) would do this, but is that accurate? If I could do an olive oil soap with goat milk and honey, I think I'd be just about the happiest little saponiere in the world.
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