(6) Verre Givre, or hoar-frost glass, an article now made in Paris, is so called from the pattern upon it, which resembles the feathery forms traced by frost on the inside of the windows in cold weather; The process of making the glass is as follows: - The surface is first ground either by the sand blast or the ordinary method, and is then covered with soft varnish. On being dried, either in the sun or by artificial heat, the varnish contracts strongly, taking with it the particles of glass to which it adheres; and as the contraction takes place along definite lines, the pattern produced by the removal of the • particles of glass resembles very closely the branching crystals of frostwork. A single coat gives a small, delicate effect,- while a thick film, formed by putting on two, three, or more coats, contracts so strongly as to produce a large, bold design. By using coloured glass, a pattern in half-tint may be made on the coloured ground, and after decorating white glass the back may be silvered or gilded.