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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