Lefranc Bourgeois clarified linseed oil is extracted from roasted linseeds.

Use: To make its mediums. As the painter progresses, his work must be his own. The painter can formulate his own mediums with Lefranc Bourgeois oils and driers.

The work of oil is subtle and lies in the art of detail. The clarified linseed oil "fine arts" quality offers the painter the power to slow down the drying of his color so that he can work on it and give it the effects he wants according to his style.
It is the most drying of the oils and allows the painter to make his own medium.
It is not recommended for use with light and transparent colors.