To produce the permanent enamel seen on photographs, thoroughly clean a sheet of plate-glass and dust over it a little French chalk, every trace of which should afterwards be removed by careful polishing. Next coat the glass with enamel collodion and allow it to set. The wet print is then laid face down on the collodion surface and well squeegeed to remove air bubbles, and afterwards set up in a warm room to dry. When nearly dry, a piece of waterproof backing paper is fastened over the back of the print, usiug stiff starch paste. When thoroughly dry, a knife slipped round the edge should be sufficient to cause the print to leave the glass readily. The collodion film is used for the purpose of supplying a glaze to matt or albumenised papers; but if F.O.P. (which is already glazed) is used, the collodion facing may be dispensed with, the wet print being merely squeegeed down on the chalked glass and treated as already described. Embossing is done by means of a press, obtainable of most photographic dealers.

The raised portion is then filled in with wadding, the print being attached only at its edges.