Workshop Receipts ...
Workshop Receipts ...
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But sometimes the colour is violet instead of black.
Brass. — (a) Cleaned up brasswork, if left in damp sand, acquires a fine brown colour, which, when polished with a dry brush, remains permanent and requires little cleaning. A green and light coating pf verdigris on the surface of the brass may be made by means of dilute acids, allowed to dry spontane- ously. The processes are, however, slow, and quicker means have to be adopted.
Before bronzing, the brass is annealed, pickled in old or dilut...e nitric acid till the scales can be removed from the surface, scoured with sand and water, and dried. Bronzing is then performed according to the colour desired. A steel- grey colour is deposited on brass from a dilute boiling solution of arsenic chlo- ride; and a blue by careful treatment with strong soda hydrosulphate. The Japanese are said to bronze their brass by boiling it in a solution of copper sulphate, alum, and verdigris. Success in bronzing greatly depends on the temperature of the brass or of the solu- tion, the proportions 6i the metals used in forming the alloy, and the quality of the materials ; the moment at which to withdraw the goods and the drying require attention.
What to read after Workshop Receipts ...?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Spon to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
But sometimes the colour is violet instead of black.
Brass. — (a) Cleaned up brasswork, if left in damp sand, acquires a fine brown colour, which, when polished with a dry brush, remains permanent and requires little cleaning. A green and light coating pf verdigris on the surface of the brass may be made by means of dilute acids, allowed to dry spontane- ously. The processes are, however, slow, and quicker means have to be adopted.
Before bronzing, the brass is annealed, pickled in old or dilut...e nitric acid till the scales can be removed from the surface, scoured with sand and water, and dried. Bronzing is then performed according to the colour desired. A steel- grey colour is deposited on brass from a dilute boiling solution of arsenic chlo- ride; and a blue by careful treatment with strong soda hydrosulphate. The Japanese are said to bronze their brass by boiling it in a solution of copper sulphate, alum, and verdigris. Success in bronzing greatly depends on the temperature of the brass or of the solu- tion, the proportions 6i the metals used in forming the alloy, and the quality of the materials ; the moment at which to withdraw the goods and the drying require attention.
What to read after Workshop Receipts ...?
You can find similar books in the "Read Also" column, or choose other free books by Ernest Spon to read onlineMoreLess
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