Crystal White is a semi-transparent white composed of lead white and leaded crystal glass in walnut oil, excellent for mixing with colors. The finely powdered glass gives this white a novel refractive appearance in mixtures with other colors. We've created this color for artists today without stabilizers (e.g. stearates, waxes, etc.) or fillers characteristic of modern whites. Finely ground crystal glass (1.51) has a refractive index similar to oil (1.48), making it transparent and hence well suited for mixing with other colors. Use it to make pale tints of colors without overpowering them.