This is a simple medium to add to tube color in order to bulk up the volume of paint. It also makes the paint more transparent and lowers tinting strength. This can be useful when using colors like the pthalos.

• 1500 grams Precipitated Calcium Carbonate
• 400 grams Refined Linseed Oil

The batch makes about 1 litre of medium, perhaps 7 large tubes. This size batch can be mixed in a stand-up mixer for half an hour, scraping the sides periodically. For a smaller amount, a large mixing knife and a slab could be used but it will require much work.