We've had Antoine in the past, but I'd never worked a peinture a l'essence before. This is a technique created by Edgar Degas that de-oils oil paints to simulate pastel paintings - no need to frame under glass. The painting was done on corrugated cardboard (to absorb oils). Maybe not the best choice of cardboard (you can use any), but I did like the warm tones. Blobs of color are set on a cardboard palette (1 hr or so) until much of the linseed (I used a water-miscible oils) was absorbed into it.