A receipt for varnishes for tinplate is as follows: Take 30 grams of sub-acetate of copper (copper green) and make into powder, spread quite thin on a porcelain plate and keep in a moderately warm place for some days. After this time, the crystal water and the greater part of the acetic acid will have evaporated. The light-brown powder that remains is then ground in a mortar with some turpentine and 100 grams of fine fat copal lac warmed to 167 degrees F., is then added. If the copper oxide has been well prepared it will be mostly dissolved after a quarter of an hour's stirring. The varnish is then put in a glass and kept in a warm place for some days, keeping occasionally stirred. The small quantities of acetate of copper, which are still deposited, are used in the next preparation. The dark green varnish gives a fine glittering color on tin, but only after the fourth or fifth coating, but two coatings will give the most varied colors after drying in a drying chamber or on warm iron plates. Greenish, yellowish, or dark-yellow gold colors, then orange, and. finally, reddish-brown shades are obtained, according to the duration of the temperature. The colors are far brighter than those obtained by English gold lac, and keep fast under light. The composition of the gold color depends on the deduction of the dissolved copper oxide into the hydrosilicate of copper, which is soluble in small quantities as gold color in the copal lac. The more deduction is obtained the darker the colors will be.