Michael Harding Artists Oil Colours Cobalt Blue Oil Colour ITEM#MHD-506-225: Colour made by hand using techniques which date back to the days of the Old Masters. As an artist and a painter, Michael strives to create colours that are true, vibrant and pure. The greater the pigment load, the greater the resistance to fading. Michael Harding colours are made without fillers or extenders. All colours, except as indicated are ground in a grade of refined cold pressed linseed oil chosen for its neutral acidity.