Glass coloring and color marking

Glass coloring and color marking may be obtained in several ways.

1. by the addition of coloring ions,
2. by precipitation of nanometer-sized colloids (so-called striking glasses such as "gold ruby" or red "selenium ruby"),
3. by colored inclusions (as in milk glass and smoked glass)
4. by light scattering (as in phase separated glass)
5. by dichroic coatings (see dichroic glass), or
6. by colored coatings