There are a zillion ways to color glass, but this is one of the easiest. These little pebbles are called "frit". Frit is made from concentrated amount of minerals and metallic oxides melted with a base glass that is crushed to various sizes. Each size has a specific use. In this case, we are using 2 colors in the #1 size. Some glass artists make their own colors. We prefer to source our frot color from our amazing friends @reichenbachcolors and @kuglercolors, both top notch German companies. The