1. Jewellers Rouge. Dissolve green vitriol in hot water, and add a solution of pearlash as long as it throws down a precipitate. Wash the precipitate repeatedly with warm water, drain it on calico, and finally calcine it till it assumes a bright colour. It is sometimes made by calcining the sulphate of iron with a strong heat, till oxide of iron only remains. Let it he triturated with water, and prepared in the same way as prepared chalk. See Polishing Powder, further on.

2. French Plate Powder. Mix one part of jewellers' rouge with 12 of carhonate of magnesia.

3. Finely prepared chalk, or burnt hartshorn. One way in which these are used is to boil them with water, with pieces of rag; the finer particles are entangled in the fibres of the rags, which are dried and kept for use.

4. Quicksilver with chalk 1 oz., prepared hartshorn 8 oz., prepared chalk 4 oz. Powders containing quicksilver, besides the necessary wearing of the surface, are supposed to render the plate more brittle. If used the quicklime should not be in larger proportion than the above.

5. Finest putty powder 1 oz., levigated chalk 5 oz.; a little rouge may be added to colour it.

See Novargent, Silvering Powder, etc, for restoring the silver to plated goods.