Has anyone used beets or beet juice to make soap?

[gigisiguenza]

http://www.lovinsoap.com/2011/07/color-soap-naturally-testing-herbs-and-spices-for-ph-stability/

This is what happens to beet in soap.

Unfortunately the article doesn't give the ph of the beet. The more alkaline a substance the more likely it is to be stable in lye. The more acid the more likely it is to morph.

I was doing research and couldn't find a reliable source (not influenced by whatever plan they were selling) of the alkaline factors for veggies. Any information would be greatly appreciated. TY.