---greg schmitz
P.S. For any kind of info having to do with metals, machining,
structure, casting, plating, etc. there is a multi-volume set called,
as I recall, THE METALS HANDBOOK. Any good engineering library should
have a set.
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Wall and Jordon. PHOTOGRAPHIC FACTS AND FORMULAS. Boston: American
Photographic Publishing, 1940. pg 332
To Blacken Aluminum - Clean perfectly free from grease by washing in soda
solution, wash well, and immerse in:
Ferrous sulphate............ 1 part
Arsenious acid ............. 1 part
Hydrochloric acid .......... 12 parts
Water ...................... 12 parts
When the color is deep enough, dry with fine sawdust, and then
lacquer. This solution is intensely poisonous.
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> Does anyone know a chemical means for blackening aluminium.
>
> I have made some lensboards for my field cameras and need to blacken them.
>
> I know I can use paint, but it doesn't seem to last very long, and while
> anodising is an alternative, the nearest facility is about 300 km away.
>
> Any ideas? or should I just get them anodised.
>
> Peter McDonald.
> Canberra, Australia
>
>
>
>
>===for PGP Key finger Greg Schmitz <gws1@cunix.cc.columbia.edu>===
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