Bronze is an alloy made up of 80% – 96% copper. To this are added other materials such as zinc, phosphor, silicon depending on the properties required.
Archives
Bronze – almost all copper
Plastic and foam
The process
- The mould, clay, registration and pouring hole for the wax.
- The silicon – smoothed with washing up liquid.
- Plaster
- The waxes, out of the silicon mould, ready to clean upCups and sprues added and the first coat of ceramic shell
- Fully coated in ceramic shell, about ten coats applied, an hour apart. Two without silica, two fine and the others coarse
- The bottom of the cup is chopped of and the wax melted out
- Small cracks are repaired with silica and then the shell is reheated before the pour
- The pour
- The silica needs to be knocked then sandblasted off. The bronze needs to be fettled = cleaned up and spare bronze recycled.
- Propane – black dye patina and wax added.
- The finished piece with the frame.
The decision to use Bronze
I have resisted bronze until now, worrying about the weight of history it carries and the fact it is so often overused – an automatic ‘go-to’ to add perceived value, whether or not the material is appropriate or needed. But last year, in the midst of political upheaval and threatened identity, I felt the need to make a series of handheld objects to hold on to and they needed to be heavy. I made them in clay and cast them in various materials such as plaster and concrete, but none gave me the feeling of dead weight I was looking for. And so, finally, to bronze. Over the years I have visited foundries, been walked through the process, discussed and even judged bronze awards, always looking for artists who will bring a new perspective. But as with all these things, it is never the same as doing it yourself, and the A-N Artist bursary has given me a fantastic opportunity to consider where this laden material might fit within my practice.
Patinas
Plain bronze colour is pale pink to yellow, depending on the type of bronze used. A patina is simply a dye or chemical reaction added, with heat, to the surface to change the colour. It is then sealed with a wax or varnish to preserve the colour. If left alone bronze gradually, and over many years, develops a dark green and/or red patina, as seen on this Early Iron Age bronze Horse Cheekpiece from the Lorestan Province of Iran.