[TheForge] Jewelry Finishes

Mon Nov 18 23:21:00 2002

At 05:48 PM 11/18/02, you wrote:


What you guys are trying to reinvent is vitreous enamel...something the 
Egyptians had down pretty well.  And while the old lead bearing enamels are 
no longer available ( mostly) a broad range of types and colors currently 
are. The problem with using regular glass ( which kind?) is that the rates 
of thermal expansion are so mismatched.  Another issue here is that when 
doing a ring, you are proposing to enamel on 2 different radiuses at 
once...I think that may involve constantly rotating the ring while 
firing.  Usually , when enameling steel, a special base coat is fired on 
first, then the top coat...then it is cooled at a specified rate. The stuff 
can be jewel-like with deep translucent colors and reasonably enduring 
except for it's inherent brittleness.
A fair amount of the glass to steel experiments you see smiths doing will 
come apart with time and temperature fluctuation.
There is a certain amount of hidden excitement in using materials  together 
that feature a big contrast in rates of thermal expansion.
            Pete


>I doubt it Terry.  When I did a glass school nearby, I talked to them about
>glass & steel and they said the glass has to be annealed in an oven over
>several hours to keep it from shattering.
>
>-----Original Message-----
>From: Terry L. Ridder <[email protected]>
>To: [email protected] <[email protected]>
>Date: Monday, November 18, 2002 8:28 PM
>Subject: Re: [TheForge] Jewelry Finishes
>
>
> >hello;
> >
> >john & bruce, would putting the piece in ash or vermiculite
> >slow the cooling process enough to allow it is cool slow enough
> >to avoid shattering?
> >
> >On Mon, 18 Nov 2002, John Chobrda wrote:
> >
> >john>
> >john> Bruce, I tried putting glass on a forged piece a while back.
> >john> It looked great until it started to cool. Glass splinters
> >john> flying about the shop. If you had an annealing oven,
> >john> and could bring the piece down slowly it might work.
> >john>
> >john> John C.
> >john>
> >
> >--
> >Terry L. Ridder ><>
> >
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