Hadar's Clay™ - Quick-fire copper is in every respect the same as Hadar' Clay™ - copper, but can be fired without carbon for only half an hour. It can also be fired with Hadar's Clay™ - Quick-fire Bronze. Before using please download the instruction manual. Instruction Manual CO07$20.00 © Copyright 2009 Hadar Jacobson - All Rights Reserved Hadar's Clay™ is a trademark of Hadar Jacobson. The terms "bronze clay" and "copper clay" are used generically and do not denote any particular product or brand.