I once tried adding 1 oz PPO of an alcohol-free vanilla extract. The vanilla scent disappeared as soon as I added it to the lye and oils, but the soap did smell a little less like unscented soap than it usually does (if that makes sense, lol).
The recipe I used usually produces a pale ivory colored soap but the brown from the extract did discolor it to a pale beige. Actually an orange vanilla FO I've used produced more browning than the extract did.
******** Oops, just checked my notes and it was 1 oz PPO (not tbsp).
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