POINTOGRAVURE
The following description is borrowed from Mons. E. Aumaître, the inventor of another process for the decoration of leather to which he has given the name of pointogravure.
The implements required are two graving-points, one large and one small, a modeller and a spirit-lamp.
The design having been traced on the leather, the whole of it is wetted with a sponge as described on page [19]. The point is then heated in the spirit-lamp and passed lightly over the line. It should be held like a pencil and heated sufficiently to produce a light brown mark on the leather, and it should run smoothly without sticking. The fine lines are drawn lightly and the point pressed more heavily for the deeper ones. Deep hollows can be made by sloping the tool, and using its widest side. The point being very small, it requires frequent heating to keep it in a condition to produce satisfactory results. It is not hot enough unless it runs smoothly on the leather and darkens the impression. On the other hand, overheating is to be avoided to prevent burning the surface of the leather. This process skilfully carried out will produce shading, hatching, and lines of great delicacy, also much softer effects than pyrogravure. It lends itself equally well to the broad treatment of a design.