Where do you buy your; what was it 32% peroxide at? Do you use enough to cover the whole skull and roughly how many gallons does that take? Seems like a lot of peroxide.
I buy mine at a chemical supply Co (Sidler chemical in Newark NJ). It cost $23 per gallon. It will take between 2-3 gallons to cover the skull. But I do so many skulls that I am always adding more skulls and Peroxide to the mix. When it stops working I use it for cleaning drains. It works better than any else I have tried and the skulls come out clean and white.