A bright, smooth, but very thin deposit of tin upon the interior of an ornamental mould may be obtained by first thoroughly cleaning the mould, then placing the open end upwards in boiling water and fastening it so that the edges are not quite immersed. In sufficient water to just fill the mould dissolve about an ounce of cream of tartar. Melt some tin in a ladle and pour it into cold water, so as to obtain it in spongy fragments. Place some of these in the cream of tartar solution, then pour the mixture into the mould. Boil the water in which the mould is placed for about an hour; the interior will then be found to have received a flue silvery, though thin, deposit of tin. Probably a bright, smooth surface and thicker coating could be obtained by first tinning the mould by the regular process, and afterwards standing it bottom downwards in Russian tallow, which is kept heated to a temperature a little above the melting point of tin; the tin would then probably melt and run smoothly over the tinned surface (in the same way that it does upon tinned iron plates), and leave a surface for polishing of a similar character.