So what exactly is metal clay?
You may have seen that we have metal clay classes at the London Jewellery School but what exactly is metal clay and how can you use it? Metal clay artist and tutor Anna Campbell updates you on the latest developments
Metal clay has been around since the 1990s but many people have never heard of it so I thought I would give a general overview and a rundown of the latest products available on the market. This year there have been a lot of exciting advances and new brands/products entering the market so the metal clay market is growing.
Just to note, I am focussing here on the brands that are easy to purchase in the UK without import costs. There are other brands available but at the time of writing these are not as easily accessible as those featured here.
What is metal clay?
All metal clays have the same basic structure – metal particles, a binder to bind the metal particles together and some water to form the clay. This can be moulded, shaped and textured before drying and firing – either with a jewellers torch or in a kiln to form metal.
All metal clays can be hallmarked by the assay office.
The two main manufacturers of silver clay are Aida (Art Clay Silver Clay) and Mitsubishi (PMC3). We use Art Clay Silver Clay in our classes at the London Jewellery School but if you have used one you can use the other in exactly the same way. Fine silver clay is also known as 999 meaning that for every 1000 particles, 999 are silver and 1 is copper.
Silver clay is available in different forms which lend themselves to different ways of designing. These are clay, syringe, paste and paper.
The syringe allows you to do finer silver work e.g. filigree. It is also useful for filling in any cracks or gaps in your work. Both Art Clay and PMC have syringe clay available.
Paste is a watered down version of clay that acts like a glue, perfect for sticking two pieces of clay together. Artists like Terry Kovalcik also use paste for painting amazing designs on their pieces.
Silver clay paper is a flat, dry sheet of clay that can be cut, woven and folded. I have recently written a blog post on origami with silver.
PMC flex is a type of fine silver clay that is flexible and has a longer drying time. Perfect if you find you need a little more time to create your pieces, it can be torch or kiln fired.
Art Clay Silver 950 – sterling silver clay
Sterling silver clay
Sterling silver is also known as 925. This means that there are 925 particles of silver to 75 particles of copper. Sterling silver is widely recognised in the UK and is stronger that fine silver so is perfect for making rings, bangles or other pieces that need more strength. You can also roll it out a little thinner as it maintains its strength and is a little stronger in the greenware stage (when dry but before firing) although still take care when you’re filing! It carves and engraves well. However, it does have to be kiln fired, torch firing is not sufficient.
Previous incarnations of the sterling silver clay needed a two firing system using carbon but this year both Art Clay (Art Clay 950 Sterling silver clay) and PMC (PMC sterling onefire) have released one fire clays. For more information you can have a look at a previous blog post I wrote about trying out Art Clay 950.
For those that are selling their metal clay pieces sterling silver clay is an attractive option as customers know what it is and are confident buying hallmarked sterling silver however the need for a kiln can put people off.
At the time of writing 3g of Art Clay gold is £259.95! Youch! It may not surprise you to know that I have not tried using it! However, there are other ways of adding gold to metal clay. I have had success with accent gold for silver which is 24 carat gold that you can paint onto fired on unfired silver clay. It is still costly, £92.95 for 1 gram, but a little does go a long way as you are only painting a layer onto the surface of the clay.
You can also use keum boo, a gold foil that is adhered to fired silver clay. You can learn how to do this on our one day intermediate metal clay class.
Base metal clays
Base metal means non-precious metals e.g. bronze, copper, iron and steel.
Copper clay is available from a number of manufacturers, for a full list see here. Art Clay Copper (at the time of writing) is the simplest of the clays to fire as it can be torch or kiln fired. Copper clay is an affordable option although not everyone likes to wear copper jewellery. However, it could be a good option for making larger pieces like bracelets.
I have enjoyed experimenting recently with bronze clay. I have been using Goldie Bronze. It is also very affordable and comes in many different colours. It arrives in powder form and is easy to make up into clay with ordinary tap water (I have a two minute video on how to do that here). This allows you to mix up the amount you need when you need it. Hard is great for making bangles and rings whereas soft is easier to carve and texture so a mix of both has, in my opinion, given me the best of both worlds. Firing Goldie Bronze does also have to be done in a two part schedule in the kiln in activated coconut carbon and, if you do it right, it works! In the UK you can purchase Goldie Bronze from Metal Clay Ltd. Metal Clay have also recently started stocking the Aussie Metal Clay brand and I’m looking forward to having a play with it. There are other brands of bronze clay on the UK market including Metal Adventures and Prometheus.
Other base metals
The original fine silver clay is still the most reliable to fire. However, it is among the more expensive of the metal clays to work with so doing some experimenting with other metal clays could prove worthwhile, particularly if you have a design for a larger piece in mind. I really wanted to make a chunky bracelet in metal clay and am currently doing so in Goldie Bronze. The cost of the same amount of clay in silver would have been prohibitive.
You do need to fire the majority of metal clays in a kiln (with the exception of art clay copper) but you may be able to find a kiln firing service in your area if you don’t have one yourself.
The final thing to note is that you do need separate tools for working with the different metals. Contamination from one type of clay to another can result in the piece not firing correctly and all your work is wasted. My main set of tools is for silver clay (as I started working in it I have more tools for silver!). I have a box of tools, texture sheets, clay roller etc that have just been used for bronze clay. Make sure you mark your tools clearly. In practice it hasn’t meant buying too many duplicate tools and I think the opportunity to try other metals has made the added investment worthwhile.
For a more in depth run down of the different brands of clay on the market see this excellent article from Metal Clay Academy
If you’ve been inspired to try a silver clay class why not join us for a day? The following classes are in silver clay:
Intermediate metal clay class – in this class you get the chance to add gold to your silver clay in one of the projects.
Would you like to try working with paper clay? Enrol on our silver paper clay class.
Author: Anna Campbell