The range consists of 70 transparent, semi-transparent, semi-opaque and opaque colours. They all have the highest degree of lightfastness (+++) and under museum conditions remain unchanged for at least 100 years. The range includes 32 mono-pigmented colours. There als also 10 colours based on highly exclusive pigments - such as the cadmiums, cobalts and chromium oxides - as well as an exceptionally transparant oxide red or yellow. Without the use of solvents, because it is easy to mix and clean with water.