Metal Clay Supply
Colorfast Chart

Kiln
PMC3
1110˚F
45 Min
Kiln
PMC+
1470˚F
30 Min
Kiln
PMC Stan
1650˚F
2 hrs
Kiln
PMC Gold
1830˚F
2 hrs
Torch
Hot Pot
Hematite
yes





Clear CZ
yes
yes
yes
yes
yes
yes
Amethyst CZ
yes
yes
yes

yes
yes
Emerald CZ
yes
 





Tanzanite CZ
yes





Perdiot CZ
yes
yes
yes†
 

 

yes
Aquamarine Spinel*
yes
yes
yes
yes
yes
yes
Blue Topaz Spinel*
yes
yes
yes
yes
yes
yes
Blue Sapphire Corundum*
yes
yes
yes
yes
yes
yes
Yellow Sapphire Corundum*
yes
yes
yes
yes
yes
yes
Red Ruby Corundum*
yes
yes
yes
yes
yes
yes
Light Pink Corundum*
yes
yes
yes
yes
yes
yes
Dichroic Glass Cabs
yes
 

 

 

 

 

Freshwater Pearls
DO NOT FIRE!

The chart above indicates what you can generally expect to remain "colorfast" when fired, with little or no color shift, though there can always be exceptions, especially with colored CZ. The reason for this is the instability of the minerals used to create various colors. As we add compatible synthetic and natural gemstones, we will add them to the chart.

*Spinel and Corundum stones are lab grown

†Slight color shift may occur.