Sunday, January 4, 2009

Small Scale Duplicate Castings

I've recently completed a short series of wall-mounted pins (brooches), playing on the idea that things–jewelery objects in particular–really change when the material changes, even if the form is identical. It's interesting to compare the value we place on precious metals compared to more utilitarian materials. The sets of three pins are based on one original pod-like form made from fusing silver sheet and wire. This is a technique where you are working with the silver in it's "slush phase", the red-heat temperature range where the silver is above a solid, but below a liquid. You can fuse pieces of silver together, scrape texture into the surface, break pieces off, melt wire into the surface. After immersing in acid to remove oxides, the surface is burnished, but a lot of the roughness and spontaneity of the process remains. Here's a picture of one of the sets:

The silver pin is the one in the middle. On the left, I used a black-pigmented cement mixed with stone dust and additives. On the right, I used white Portland cement with stone dust and additives, and after it was set I rubbed in a thin slurry of pigmented cement, which was mostly then rubbed off.

After some research I discovered the ideal molding material. It's a two-part silicone called Knead-a-Mold. (There are other brands as well.) You take equal parts and mix the putty-like substance together with your fingers–it's completely non-toxic and can even be used for food molds–until the colours are blended completely, then push it against and around the object you want to duplicate. I did this with the silver pin, let it set, then cast plaster around that to give the mold support, then took all the components apart. I mixed up the cement and packed it into the empty silicone mold backed by the plaster. I had previously made pin back assemblies which I embedded into the cement before it set.

The concrete pins are dentical in every way to the original silver one, except in the material itself. Every detail of the metal's fused texture is visible. These two-part non-toxic silicones have amazing potential. I mounted the pins onto a matte white acrylic sheet so they could be placed on a wall when not being worn.

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