Filia Oil Crayons. These oil crayons, from the Danish traditional family company Filia, have been a classic for decades. The lightfast colours are transparent and mix very well. They offer many interesting painting and drawing techniques. With a sponge and turpentine, it is possible to "watercolour-paint" a drawing with these oil crayons. These classic crayons are square and have a tip for outlining or two-dimensional drawing and shading. These crayons are available in 36 colours. Cardboard box, 12 crayons, 60x7.5x7.5 mm (2.36x0.3x0.3 inch), 12 colours assorted, no black.