Glass cobalt blue refers to glass items made in a rich, deep blue color known as “cobalt.” This color is created by adding cobalt oxide during the glassmaking process. The result is a vibrant, eye-catching blue often seen in bottles, dishes, vases, and decorative wall plates. Cobalt blue glass is popular because it adds a bold splash of color without being overwhelming. It looks gr... https://switchhits.com/products/deep-cobalt-blue-glass