Re: Etching
sal (sal@napc.com)
Tue, 28 Oct 1997 13:46:32 -0500
Keith Dowsett wrote:
>
> At 16:24 27/10/97 -0500, you wrote:
> >Dear List,
> > Does anyone know what acid would be most appropriate in etching silver?
> >A jeweler friend of mine asked if it would be possin=ble to put a
> >photograph onto one of her pieces. I immediately thought of maing aa
> >resist with carbon tissue and etching in a similar way as photogravure
> >plates. Would sulfuric acid work?
> >
> >wallowing in ignorance,
> >Sal Mancini
>
> Sulphuric acid (UK spelling ;) will be slow. You could speed it up by adding
> a small amount of dichromate. Unfortunately this might destroy the resist too.
>
> Have you considered doing it electrically. Set up a silver plating bath, and
> run it in reverse (swap the wires) to remove silver from your work. You can
> control the etching so some extent by moving the cathodes around. Providing
> you control the current and voltage you should be able to prevent gas
> formation which might peel your resist.
>
> Just an early morning thought,
>
> Keith.
> ------------------------------------------------------------
> Keith Dowsett "Variables won't; constants aren't."
>
> E-mail: kdowsett@rpms.ac.uk or kdowsett@geocities.com
>
> WWW: http://kd.rpms.ac.uk/index.htm
> http://www.geocities.com/CapeCanaveral/Lab/8979
Would this method be suitable if the object in question was round?
Please forgive if this is a stupid question. I had never thought of
doing this electrically. hmmm
TIA,
Sal