I have done two white bars. The whitest one, Shea Butter Supreme, was from Anne Watson's book, Smart Soapmaking. Makes a very hard bar with medium to decent lather (guess it depends on personal preference how you would describe):
10.5 oz coconut oil
10.5 oz olive oil
9 oz shea butter
8 oz distilled water
4.2 oz lye
I have also heard of plain Crisco soap producing a stark white bar. I did a batch with coconut oil and sweet almond oil, but I also added ground oats and lavender buds. Still turned out pretty white with the add-ins but nowhere near as white as Anne's. I would describe the 2nd one as a murky white. It also hardens very quickly.
I posted a picture in the Show off thread of the Shea butter supreme. Just finished the Crisco soap last night. I hope this helps in revealing some options.
