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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Guide on how to produce a permanent black finish for brasswork.

Identifier  ExFiles\Box 38\6\  Scan149
Date  8th July 1916
  
"Autocar".

July 8th 1916.

X.3424.

USEFUL HINTS AND TIPS.

Permanent Black Finish for Brasswork.

The following method of producing a black finish on brass or copper work should interest those motorists who find the constant labour of keeping bright the brass lamps, and other car fittings, calls for too great a demand on their time. The results are very pleasing in appearance, and the black finish produced is capable of withstanding a considerable amount of wear.

The brass work to be treated should be well cleaned and polished, and quite free from grease.

The following solutions are required :-

A.{Mr Adams}- Nitrate of copper --- --- --- --- --- 6 ozs.
Water --- --- --- --- --- --- --- 6 ozs.
B.- Nitrate of silver --- --- --- --- 6 ozs.
Water --- --- --- --- --- --- --- 6 ozs.

When required for use these two solutions should be mixed together as follows:-

Copper solution A --- --- --- --- --- 2 parts.
Silver solution B --- --- --- --- --- 1 part.
Water --- --- --- --- --- --- --- 3 parts.

The article to be treated should be uniformly heated in an oven to a temperature of about 250° Fahr. and the solution uniformly applied with a soft brush, when it will dry very rapidly and leave a green coating. Two or three application of the solution should be given. When cool the loose fluffy deposit should be brushed off the surface with a stiff
  
  


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