Pure white microcrystalline wax is used as a plasticizer. It is more flexible than paraffin and melts at 170 to 180 degrees F. It is ideal for building up layers of texture on your encaustic paintings and ensures the integrity of your paint film. Microcrystalline wax melts at a higher temperature than our paints and beeswax (143 to 150 degrees) which allows you to apply encaustic paint over the modeled surface with minimal disturbance to the bottom sculpted surface. Microcrystalline wax will yellow over time from exposure to UV so it is very important to paint over and encapsulate the impasto wax layer. Microcrystalline wax is a petroleum-based wax, which will give off vapors in the molten stage. Extra consideration should be taken to provide proper ventilation.