Oil Medium Calculator

Each successive layer of oil paint should contain more oil (fat) than the layer below. This is because oilier layers are more flexible and take longer to dry. If a lean (dry) layer is placed over a fat (oily) layer, the top layer dries first and cracks as the bottom layer continues to dry and contract.

Yes, but use it sparingly. Pure linseed oil slows drying significantly and can cause yellowing over time, especially in light colours. For general painting, a 1:1 mix of linseed oil and turpentine gives a good balance of flow and drying time.

Damar varnish (dissolved damar resin) adds gloss, transparency and body to oil painting mediums. It is typically used in glazing mediums at a 1:1:1 ratio with oil and turpentine. It helps glazes dry with a luminous, glass-like finish.