Mid-Fire Glazes
Mid-Fire Glazes
Both are certifications received from the Art and Creative Materials Institute as a result of extensive toxicological testing. AP is for products that contain no materials in sufficient quantities to be toxic or injurious to humans, including children, or to cause acute or chronic health problems. CL is for products that are labeled in accordance with the chronic hazard labeling standard and are certified to be not hazardous if used in accordance with directions on packaging.
Speedball glazes and underglazes have a shelf life of 2 years after manufacture, however when properly stored and maintained they can last much longer.
To get the best results with Mid-Fire glazes, we recommend bisque firing to cone 05/04 and doing a test tile on your clay body and preferred firing method. We do not recommend any slow controlled cools, as this can effect the final appearance of the glaze.
Yes, however the finished appearance of many of the glazes may change at higher temperatures. We recommend doing test tiles and your own dinnerware safety testing prior to use on any finished pieces.

color overview
Midnight Plum provides an intense dive into a gloss glaze worthy of royalty. Somewhat opaque in finish, Midnight Plum glides smoothly over high points and textures pausing with sky blue colors at the breaks.
| Cone 5 Results | Glossy, deep rich purple, light blue breaks |
| Cone 6 Results | Glossy, deep rich purple, light blue breaks |
| Recommended Layers | 3 average coats |
| Notes | No slow cool |