Spectrum Glazes Spectrum Robin’s Egg Blue 8oz.

Spectrum Glazes Spectrum Robin’s Egg Blue 8oz. from World of Craft. Spectrum 400 Series Super-Strokes Underglazes. These underglazes were specifically designed for bisque application. The Super-Strokes Underglaze line consists of an assortment of rich, vibrant underglaze colors that are opaque with 3 coats, semi-opaque with 2 coats and semi-transparent with 1 coat application and can also be used as a one-stroke underglaze.