Home / Colours & Pigments / Oil Colours / Michael Harding Artists' Oil Colour / Michael Harding Mediums & Varnishes / PM1. Oil Paint Medium, Michael Harding, 250ml bottle PM1. Oil Paint Medium, Michael Harding, 250ml bottle £13.40 £16.08 (inc. VAT) Michael Hardings' basic oil paint medium. A stand oil / turpentine mixture to add to oil colour. Add to your Wish List Information A simple Oil Paint Medium from Michael Harding. Oil paint medium is a basic paint medium designed to ease flow and increase gloss, transparency, depth and beauty of the pigment colour. This medium is a linseed stand oil, turpentine, formulation that prevents yellowing of paint film. Specifications Country of Origin: UK Brand: Michael Harding Product Code: UK Weight: 0.5kg