So, I did another batch of test soaps, and I wanted to report back since a couple of us have had mixed results with the VS.
I did 4 test bars with different levels of VS and a variety of FO suppliers.
-Celtic Moonspice (Rustic Escentuals, 8.7% vanillin)- used a 1:1 ratio of VS to FO. Results: VS did not work. Soap is discoloring after 1 week of cure. No softness or oily weeping.
-Cedar & Saffron (Brambleberry, 3% vanillin)- used a fourth of VS to FO amount . Results: Soap is lighter than soap without the VS, but not as light as other soap results . No softness or oily weeping.
-Rich Dark Chocolate (Brambleberry, 15.9% vanillin)- used a 1:1 ratio of VS to FO. Results: Did not discolor, a little soft but no obvious weeping or oily oozing.
-Vanilla Fig (WSP, 8.6% vanillin)- used half of amount of VS to FO. Results: Did reduce some of the discoloration, but color is still patchy and orange after 1 week of cure time . No softness or oily weeping.
-Vanilla Bourbon(WSP, 4% vanillin)- used one fourth the amount of VS to FO amount. This FO was used 1:1 in original test batch and was one of the most oily, oozing samples. Results: Did slightly reduce discoloration, but not as much as before. The soap is a little soft but does not weep or ooze as much as original sample.
So, my conclusion right now is that, if I really plan on using a particular color scheme with a discoloring FO, I need to test the specific FO and VS in advance. Results can vary based on FO supplier and amount of VS used. It does seem that reducing the VS helps to prevent the weeping, oily issue I was experiencing, but the soap is still not as bright as using the 1:1 ratio.