FS999™ Fine Silver Clay 50g

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Quantity 2+
Price £93.99

Wet Clay

Ready to use directly from the package, the first thing you will notice is its smooth, creamy consistency. The clay accepts and telegraphs the smallest of details in textures very well. It is easy to roll and form, and is surprisingly non-sticky. It also has a high moisture content, making it easy to work with in its wet form. For best long term storage and to maintain hydration and workability, store unused FS999 in a clay hydrator charged with distilled water.

Silhouette Paper Cutter

FS999 clay, when rolled to 1 or 2 cards thick, cuts like a dream on the Silhouette paper cutter.

Greenware and Dry Construction

In its dried, greenware stage, FS999 is easy to sand and carve. Dried pieces are very flexible, less delicate and less fragile. Dried pieces can be easily adhered to each other using distilled water. Use paste for filling cracks and seams.

Embedding Objects

Cubic zirconia, lab created gemstones, bezel cups and other findings or embeddables can be co-fired with FS999. Most, but not all, cz’s and lab created gemstones can be fired at 1650°F / 900°C for 2 hours on an open kiln shelf (see Firing Schedule below) without failure or color change.


After ensuring the clay is bone-dry, kiln fire on a hard kiln shelf raised up from the kiln floor. Fire at full ramp speed at any of the times and temperatures below:

  • 1650°F / 900°C - 30 minutes - 2 hours (depending on piece size)
  • 1600°F / 871°C 1 hour
  • 1550°F / 843°C 2 hours
  • 1450°F / 788°C 4 hours
  • 1400°F / 760°C 6 hours

Note: Muffle kilns have heating elements on three sides (no heating element in the door), therefore any air leakage around the door can create cool spots near and around the door. For this reason, to ensure complete sintering, we recommend firing all metal clays in the rear center portion of the kiln.

Carbon Firing

After ensuring the clay is bone-dry, kiln fire using a firing vessel filled with coconut, coal or magic carbon. Place container on a raised kiln shelf. Use the two stage firing method below: Full ramp to 1000°F / 537°C – hold for 30 minutes, then full ramp to 1650°F / 900°C – hold for 3 hours.

Torch Firing

Using the bushy flame of the torch, bring bone-dry clay to a dull red glow while continually moving the flame about the piece. Continue at this temperature/glow for a full 5 minutes or more, depending on the size of the project. To avoid under firing or over firing requires basic knowledge of torch firing skills for metal clay. To ensure full and complete sintering, especially with larger, thick items or for pieces to be bent post firing, we recommend kiln firing.


During firing, FS999 will shrink 8% to 9% as a result of the sintering process, as the organic clay binders burn off in the kiln.

Finishing and Polishing:

When finishing, FS999 provides either an easy satin finish, or if you like, a beautiful mirror finish.

For a satin finish, brass brush your piece directly out of the kiln, followed by 1 to 2 hours in a rotary tumbler. A magnetic tumbler will drastically reduce the time needed in a tumbler.
For a mirror finish, use the same process as above. Then, using a flex shaft or other rotary tool, polish with radial bristle discs and lastly, silicone polishing wheels and points.


FS999 is an excellent choice for enameling. Like all fine silver, FS999 accepts both transparent and opaque enamels beautifully.


To achieve a good, dark result from Liver of Sulfur (LOS) or Patina Gel, ensure your piece is absolutely clean by soaking and then brushing with hot water, soap, and ammonia. Using a strong solution of LOS in very hot distilled water, dip or soak your piece in the solution until you get the darkness or result you desire. Adding a teaspoon of ammonia to your LOS bath can also help achieve a darker result or possibly a rainbow effect. A bath of baking soda and water will neutralize the LOS bath and halt the patination process. Then, either by hand or by machine, bring up the high points with a polishing cloth, Scotchbrite™ pad (satin finish), or polishing wheels (high shine or mirror finish).


Once fired, FS999 is metallurgically just like other fine silver metals, but like other fired metal clays, it is more porous than sheet stock or cast items. Due to this porosity, FS999 will “soak up” solder. When possible, prepare areas for solder by burnishing to close the open pores and reduce the tendency to absorb solder. Join other metals and findings to fired FS999 by using the same flux, solder and torch(es) as you would to solder other silver products or gold.


Hallmark as .999 FS or Fine Silver