Colouring Hardened Iron.

Practical Magazine 22, 1876

(Chemistry applied to the Arts, Manufactures, &c.)

The "Phönix" answers the question addressed to it, "What means or procedure are to be used for giving hardened iron the beautiful colour seen on parts of gun-locks?" as follows: – The iron parts, after having been well polished and rubbed dry, are put into a closed box with pure burned leather, and exposed to a steadily burning wood fire. After the box has been standing for about half an hour in a red heat, the contents are turned out into a water tank; the parts are then dried, slightly heated, and coated with benzoin tincture, by means of which the colour obtained receives an especial lustre.

- Der Metallarbeiter.

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