450gm Castor Wax (hydrogenated Castor Oil)
Add to beeswax to create Encaustic Medium. this adds hardness and shine to the wax. I recommend a ratio of 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 beeswax to 1 part castor.