Available in a wide palette. Oil penetration and haloing over time. Some smudging but not as extreme as unfixed pastel. Efflorescence or wax bloom may be present. Soluble in aromatic hydrocarbons.
Many colors are sensitive to light.
The colorant is mixed with linseed oil and melted wax and poured into molds. Now available in over thirty colors. A strong and lingering odor of linseed oil. Oil penetration and haloing over time. A tough film may form over thicker layers of medium.