Aluminium pigments have no colour of their own. The metallic shine is caused by the reflection of light from the pigment flakes. Coloured aluminium pigments whose surfaces are coated with colouring agents are now available or are under development. Also new are aluminium pigments coloured by controlled oxidation. These Aloxal types are champagne coloured pigments which open up completely new colour possibilities. Mixed with colour pigments, warmer shades can be achieved than with conventional aluminium pigments. The Aloxal® pigments are weather-resistant and stable in circulation lines.