magnesium carbonate hydroxide tetrahydrate (chalk)

[bellonet]

Hello,
I was wondering if I could use magnesium carbonate hydroxide in order to make my cold process soaps whiter. Any insights?
I have a lot of it, thus if it works I would rather use it than buy titanium dioxide.
If I can try to use it, I know its water soluble but is it also oil soluble?

Thank you!

 

[Marsi]

Chalk is calcium carbonate (CaCO3)
Magnesium carbonate hydroxide tetrahydrate (4MgCO3·Mg(OH)2·4H2O) is a product sold as a filler for polymers and flame retardant mixes.

While the product itself is not harmful, it will break down in water.
Hard water (containing Magnesium or Calcium or both) used for soap production increases soap scum.

Short version: Adding this to your soap will increase soap scum.

Why not try two very small batches - one with your additive and one without, and compare the difference?