000101 Stiff Black Opalescent

Cold Characteristics

Consistent color.

Working Notes

Stable. No color shift.

Compared to Black (000100), Stiff Black (000101) has a slightly higher viscosity, meaning that it is a stiffer glass. In most kilnforming applications, Black and Stiff Black can be used interchangeably. Kilnforming applications where differences between Black & Stiff Black might be noticed include working with elevated drop ring molds and kilncasting.

Stiff Black was originally developed for glass blowing purposes such as the Roll-up Technique. Using Stiff Black in kilnformed panels for this application creates a more uniform viscosity, which is easier to control.

Working Notes

See sheet glass notes for this style.

Cold Characteristics

True black, looks identical to Black Opalescent (000100-0576).

Working Notes

Torch: Holds a crisp edge in the flame longer & hotter than 000100-0576.

Kiln: Working properties and kilnformed characteristics are consistent with sheet glass. See sheet glass notes for this style.

Other: Stiff Black was originally developed for glass blowing purposes such as the Roll-up technique. Labeling is encouraged because it looks identical to 000100-0576.

Working Notes

See sheet glass notes for this style.