Sennelier Cobalt drier - 75ml bottle

Contains cobalt, zirconium, zinc and calcium salts.
Highly concentrated: use in small doses, i.e. a few drops for a knob of colour (less than 0.5%). Any excess could lead to cracking.
Provides well-balanced drying of the oil colour, both on the surface and in depth.
No effect on hue or gloss.