I really like to add clays to my lye water; I have read that it helps to 'release' all the minerals into the water. You could then strain your lye solution and have colourless soap with benefits of clay (theoretically), but I never do that because I have a vision of my lye splashing everywhere while I play with the straining.
In the past I have also added clay:
- to my oils (I can mix clay with oils and get an even colour, however often the bubbles appear if I use my stick blender)
- at trace (the clay can be hydrated in water prior to that or dissolved in oils, both work well for me).
It is believed that the clay will absorb the water and therefore speed up trace, so probably it's good to soak it/hydrate in water first if you want to do any superswirls
.
I use clays for colour and I like the feeling that I have added something special to my batch
, but I also notice they make some difference in terms of bubbles (a slippery feeling?). I add around 1 teaspoon ppo (I have just browsed through my notes and I used 2 teaspoons of green clay in one batch ppo with good results, too).