General Discussion
In reply to the discussion: Please stop buying big plastic bottles of laundry detergent [View all]ProfessorGAC
(76,946 posts)...in the upper mid pH range. (Around 10.0)
It is used because skin oils have some low pH artifacts that can exchange ions with soap, making the effective concentration go down.
Borax is not a huge safety & health concern in cleaning products. The risk is from ingestion & inhalation, so it's no longer allowed in foods.
As to "natural" soap, there is no other kind. Soap is made by reacting a strong base with a fat or oil. (Those are chemical analogs, but fats come from animals & oils come from plants. The former would be tallow, lard, mutton, the latter being coconut, palm, soybean, corn, and so on.) So in the case of the product you're mentioning, "natural" is a marketing word. There's no other kind of soap.
The process your describing is still susceptible to the lower efficacy & hard water intolerance issues I mentioned earlier.
Basically, I'm objecting to the notion that your home concoction is an effective alternative to synthetic surfactants, though we agree that the mass marketers ought to be pursuing more eco-friendly packaging.