Put some powdered magnesia into a saucer. Have ready a few bits of new canton flannel. It is well, in cutting out canton flannel, to save the small shavings, or clippings, for this purpose. Dip a bit of the flannel into the magnesia, and with it rub the silver, very hard. It will brighten, immediately, if there are no black stains on it. Finish, by polishing with a clean piece of the flannel, without magnesia.
Dark stains on silver are best removed by rubbing them with flannel, dipped in sulphuric acid. This should be done before any brightening substance is applied.