The process employed in its production consisted in covering the under side of a plate of glass or rock crystal with gold leaf. On this were traced the outlines of the design intended to be reserved in gold, and the remainder of the gold was then removed. In the painting which followed, the finest details, the high lights, the shadows and flesh tints were first executed. Then came in successive applications, transparent varnishes of different colours and thicknesses, in accordance with the value of the tones desired. Small pieces of silver leaf were applied to certain parts to reflect the light and heighten the effect; and the whole was finally backed with a sheet of metal.[129] [129] _La collection Spitzer_, III, p. 53. Verre églomisé appears to take its name from one Glomy, a French craftsman of the eighteenth century, who produced a special black and gold varnish which he applied to the back of glass. In a similar way his countrymen the Martins gave their name to the varnish of their invention. Verre églomisé, a somewhat unsatisfactory title, which came first into use in the latter part of the century, and was wrongly applied to paintings under glass of a similar order, has been retained ever since. A peculiar and characteristic species of pendent ornament, numbers of which were produced in the seventeenth century chiefly at Barcelona, are certain badges worn by members of religious corporations. They are of open-worked gilt brass enriched with white, black, and blue opaque enamels fused into recesses stamped in the surface of the metal. These badges, which are either triangular, oval, square, or oblong in shape, are formed of two parts--a frame surrounded with rayed patterns, and a central portion ornamented with various designs (Pl. LIII, 5). Among the latter designs are crowned monograms of Christ or the Virgin, with emblems such as palm leaves, and the device of a nail and the letter S interlaced--a rebus for "Esclavo." Fitted in the back is usually a miniature under crystal. In point of technique these enamelled badges offer an interesting comparison with the well-known English enamels of the same date applied mainly to objects such as candlesticks and fire-dogs. Pendent badges of the same designs exist in gold. The collection of Señor de Osma at Madrid contains several examples.