A staple for hot glass artists, you will find frit useful for many applications, including jewelry and casting projects. Frit is made from sheets of System 96 art glass which is crushed, screened, and then packaged in convenient 8.5 oz jars. 96 COE. Glass is opaque. This color is a copper-bearing formulation that can be used to create stunning effects when combined with Red Reactive glass and frit by taking advantage of chemistry and heat. As the particles of adjacent glass melt, the elements in Red Reactive glass or frit respond to neighboring glass containing copper and cause a color change where they meet. This reaction appears as a red-tone line or halo that can vary in intensity depending on copper content, temperature and time. Mariner Blue color typically results in a strong reaction to Red Reactive Transparent glass #X60003, Red Reactive Transparent frit #XF0032, and a strong reaction to Red Reactive Opal glass #X60045, Red Reactive Opal frit #XF0452. Extending the firing time, increasing the processing temperature or adding additional firings can help intensify the reaction created when you create with this glass and Red Reactive. Click here for more information. Frit size can be used to control the opacity of your cast project, the larger the grit the better the clarity as showcased in the frit pyramid shown in additional images. Fine and medium frit are excellent for adding small details to your fused project as shown the nature scenes created by artists Melanie Churchill and Julie Haan. Cast heart box image courtesy of Colour de Verre.