Mr. and Mrs. Coltman by Joseph Wright (Wright of Derby), a double portrait of the 1770s, is one of the few known paintings of that period which has never been lined. Because the painting was in reasonably good condition, structural treatment was confined to an absolute minimum. After the painting was cleaned, the tacking edges were strip-lined and the canvas was remounted on a blind stretcher. A diagram of the mount and a radiograph of the painting are included in the text.