450gm Castor Wax (hydrogenated Castor Oil)
Add to beeswax to create Encaustic Medium. this adds hardness and shine to the wax. I recommend and use 8 parts beeswax to parts 1 part Castor wax. for a harder more brittle medium increase the amount of castor wax. you can experiment but i would not go to more than 6 parts beeswak to 1 part Castor.