Rainbow Tints on Brass and Other Metals.

The Manufacturer and Builder 8, 1876

- Dissolve 3 parts hyposulphite of soda in 30 of water and mix in 1 of sugar of lead. The mixture is precipitated on being heated to 70° or 80 ° Réaumur, depositing sulphuret of lead. In the presence of any metal this deposit is made upon it. According to the thickness of the deposited layer various iridescent colors appear on the surface of the metal. To produce this coloration uniformly the object should be heated equally throughout.

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