Red and blue lines as seen on old Sheraton inlaid work are gained by inlaying narrow stringing, stained before insertion. It is not worth the expense to stain them with acids if only a small quantity is required, especially as good results can be obtained by the use of aniline dyes, which should be mixed in hot vinegar. If the work is imitation stained marqueterie, use aniline dyes dissolved in spirits, with the addition of at least a quarter of its bulk of polish or spirit varnish.