I find that adding enough salt to harden a bar makes it a bit on the brittle side. SL did not. JMO.
Did you have that problem when cutting or during use ?
Interesting, that was never a problem for me (but I'm using a piece of wire to cut soap so brittleness is never a problem).
I used salt in 2 cases:
- 1-3 tsp ppo - to harden a medium-hard bar
- much more - to harden an extremely soft bar (like a pure sunflower oil)
In neither case did I get any brittleness, but in second case there was virtually no lather. But I would expect some brittleness if using more than 1t ppo to harden a particularly hard bar.
Anyway, brittleness can be compensated with sugar/glycerin, I am more curious about the lather issue.
Like, for example - can you possibly use SL in large quantity (15%) to harden a very soft bar and still get good, oomphy lather ?