If I'm not mistaken, C-3 is 100% soy: From NatureWax: What is the difference from C-1 and C-3? NatureWax has two Container Blends that are called C-1 and C-3. The main difference between these waxes is that C-1 consists of a blend of Vegetable Oils, whereas C-3 is 100% Soy Based. I use C-1, which is why the conversation caught my attention. I love the C-3 in my blend. I do add a bit of Palm and J-50 to make it behave however.