I am a soapmaker. As you all know, in order to make soap, one has to combine dissolved lye (NaOH) with fats and/or oils.
My concern is that the various oils like coconut oil, palm oil, olive oil, bacon grease, castor oil, avocado oil may have preservatives, conditioners, coloring, and other additives. If lye gets in contact with food additives such as these, is anything dangerous or toxic produced ?
Thanks for your time.