In brief, the Courtrai drier makes the oil «hyperventilate» to demand more oxygen and accelerate the hardening of the layers of paint. Contains calcium and zirconium salts. Greater drying power than White drier. Dries the oil in-depth. Reduces the difference that naturally exists between the normal drying nature of most colours and the slow drying tendency of certain other colours. May be mixed directly with the oil colour (2% maximum) or thinner, adding several drops (5 maximum) per 5 ml. Excess drier adversely affects the final quality of the paint film. 250 ml Jar.