Esther Earl. (Redirected from Esther Day) Esther Grace Earl (August 3, 1994 â August 25, 2010) was an American author, internet vlogger, online personality and a Nerdfighter, as well as an activist in the Harry Potter Alliance.
To begin controlled cooling, allow the kiln to cool as fast as it can for the first 300Â° so the controlled portion of the firing is taking place about 300Â° lower than the cut-off temperature.
(In fact, the high temperatures in a kiln would ruin polymer clay and release potentially dangerous fumes.) Though it varies slightly by brand, most polymer clay must be cured at 265Â°F to 275Â°F (129Â°C to 135Â°C) for at least 15 minutes per Â¼ inch (6mm) of thickness.