20g Jeweller's Greenish Yellow Bronze
Prometheus Jeweller's Greenish Yellow Clay must be fired in a kiln with shrinkage between 13-14%.
Fire in a pre-heated kiln at 500°C for 15 minutes, then place the clay on a fireproof surface and allow to cool.
Fill a container with activated carbon, then close the lid and place into the kiln at 800°C for 1 hours.
* Please note that date on the back is production date - not best before.