Sandy --
>From one of the amateur telescope makers there is also this site, that
explains how to anodize aluminum
http://www.focuser.com/atm/anodize/anodize.html
Seems a simple enough and relatively inexpensive process. I haven't tried
it, but it would be worth a shot.
-- Bradley
----- Original Message -----
From: "Sandy King" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, February 26, 2001 2:57 AM
Subject: Re: [Cameramakers] Re: Blackening Brass Rails
> Do you have any formulas for blackeining aluminium?
>
>
>
>
> >Hi y'all --
> >
> >Let me preface by saying that #1 I am not a chemist so I take no
> >responsibility for the information I am about to contribute. and #2 I
have
> >not used either of these formulas, so YMMV and be careful, I take no
> >responsibility so don't sue me if you lose and eye, burn off all your
skin,
> >your wife leaves you, your cat pukes or your dog bites your ankle or you
> >ruin an expensive piece of brass. All that said, here is what I have
from a
> >pretty thick book on my shelf.
> >
> >According to 'Formulas, methods, tips and data' by Kenneth M. Swezey
(1969)
> >Popular Science Publishing Company, Inc.) library of congres card catalog
> >number 68-54377
> >
> >-- Begin Quote from book --
> >Before applying any of the following formulas be sure that the metal to
be
> >treated is absolutely clean. If lacquered, remove this finish with a
lacquer
> >solvent or a heavy -cutting buffing compound. Unlacquored brass, copper,
> >and aluminum can be celaned by rubbing with a good metal polih. Wash in
hot
> >water with a strong detergent and follow with hot-water rinse.
> >
> >Many of the processes are simply artificially induced corrosion. Others
etch
> >the metal bare. To prevent continued action rinse them i nvery hot water.
> >Brass, copper,and aluminum objects can them be waxed or coated with a
clear
> >metal lacquor. Colored steel tools and hardware should be coated with
oil.
> >--
> >
> >Black on Brass
> >
> >Dissolve 1 ounce copper nitrate in 6 ouncees of water and apply to the
> >brass. Then heat the brass to change the copper nitrate to copper oxide,
> >which produces a permanent black finish. Instead of heating, you may
apply
> >this solution over the copper nitrate coating.
> >
> >Sodium Sulfide 1 ounce
> >Hydrochloric Acid, concentrated 1/2 ounce
> >Water 10 ounces
> >
> >This will change the coating to black copper sulfide.
> >
> >--
> >Dull Black on Brass
> >
> >Dissolve copper scraps in concentrated nitric Acid dilluted with equal
> >amounts of water in a glass container. (Caution nitric acid is extremely
> >caustic.) Immerse brass object in solution until desired depth of black
has
> >been produuced. Remove and wash well with water. if desired, the coating
can
> >be given a sheen by rubbing with linseed oil.
> >-- End quote from book. --
> >
> >-- There are also ways for a golden matter antique green and several
other
> >colors as well as plating and other such things.
> >
> >-- Bradley
> >
> >
> >_______________________________________________
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>
>
>
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