Lefranc White Courtrai Drier

Lefranc Bourgeois are a paint manufacturer with a long history of supplying to artists since their beginnings in 1720.

From their website: White Courtrai siccative helps to dry oil colours as it is easy to use. It is important to be precise with the quantities: one drop to one part colour. This direct addition to colour should be carried out with slow-drying colours. It can also be used at 1 to 5% to create painting mediums.