15 cm x 20 cm, Oil on Board, Alla Prima
The dirty bottle contains my painting medium. I use the mixture Carol Marine recommended in her blog: 2 parts linseed oil, 1 part linseed stand oil and 1 part odorless mineral spirit (e.g. Schmincke Terpin). Works fine for me.
The bottle on the left is sunflower oil I use for cleaning my brushes. I use just that and no chemical solvents. Since i use oil for cleening my brushes stay in good shape for much longer.