Tracings
Tracing paper is largely in request, not only as a means of repeating details and units by transferring, but when copies of a drawing are required. It can be obtained in rolls varying in width, forty inch being generally useful, and in different surfaces, rough and smooth, the former being good for pencil work—the smooth being more suitable for ink tracings.
When tracings of a more durable character are required they are made on linen, which for this purpose has a highly glazed surface on which the ink will not always run equally. This can be rectified by lightly rubbing the surface with French chalk and by adding a little ox gall to the ink. The latter is a useful agent in counteracting any greasiness of surface and is often necessary in colour work.