S. In some shops [1] where they prime canvas, I have seen flour paste used: is this improper?,F. Flour paste is very bad, because if it is too stiff it causes the colour to crack and scale off, and if it too weak the damp causes the canvas to decay, and the rats eat it. These persons use it because they prime very bad canvas, which perishes in eight or ten years, and because the flours paste fills up the holes of the canvas.,