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A quick search found this source for lye and an interesting lye calculator.
I have no affiliation and only post this for interest:
Buy Lye. The place to purchase Sodium Hydroxide or Potassium...

Daniel, thank you for that detailed recipe, fascinating!
I'm wondering what material should be used for the vessels?
I'm guessing the water and lye should be mixed in glass or HDPE?
And the oil...

Any chance of posting a small batch, stove-top, step-by-step recipe for us who have never made soap before? Or a tested link?