To treat white enamel to prevent it setting too quickly, it should be thinned with the same varnish as is used in making it. To enamel successfully, get a good flat ground to work upon, and do not try to improve the work by giving a second coat of enamel if the first does not turn out well. Never put a bright on a bright; the correct way is to finish a gloss on a flat, or a flat on a gloss. In the case of spoiled work, the work should be rubbed down with ground pumice-stone, flatted, and then enamelled again. Enamelling should be done in a warm room. All enamels become ropy if exposed to the air; keep well corked, therefore, and pour out for use only a small quantity at a time.