| 摘要 |
<p>Photoengraving process for the prodn. of enamelled brooches, medallions, etc., comprises exposing a plate of Cu which has a coating of a light sensitive substance through a mask such as a photographic transparency, and after development of the exposed zones, the plate is etched by means of acid. Both faces of the plate are coated, and one face is exposed through a mask having the silhouette of an object, whilst the other face is treated through a mask having in addition to the silhouette, lines marking out additional details such as different zones. The plate is then etched on both surfaces to give a piece having the outline desired with recesses delineating the various zones. These are filled with enamel powder of the colours desired, and fired.</p> |
