Verb — Seizing is what happens when your soap turns from a lovely pourable "batter" into a unpourable mess! Often it means setting up into a thick "glop" close to medium-thick oatmeal, but if you step away and your soap seizes it can turn into oatmeal cookie dough really fast. Seizing can be caused by some fragrance and essential oils, but some other factors can cause seizing, such as temperatures or oils. Seizing can sometimes be controlled by adding lecithin (a vegetable based emulsifier), warming your fragrance oils before adding to traced soap, diluting scent with base oils, and controlling temperatures.