This is my #1 go to for coloring my soaps white.
It works best when mixed in a bit of oil and mixing before adding to your soap. If you don't mix it well so the titanium dioxide is well dissolved you may have white spots in your soap.
1/4-1 tsp. per pound of oils in your soaps.
1/2 tsp. per pound of melt and pour soap.
If you overheat your soap the titanium dioxide may cause glycerin rivers in your soap. This is not necessarily a bad thing and it looks cool in some soaps.
Titanium Dioxide is an all natural pigment powder that makes a great base for white soaps and mineral makeups. It is also commonly used in sunscreens and countless other applications including coloring products white.