Cobalt Blue Glass Coffee Mugs

cobalt blue
A deep blue pigment containing cobalt and aluminum oxides
The deep blue color of this
greenish blue: a shade of blue tinged with green
greenish-blue pigment consisting essentially of cobalt oxide and alumina
Cobalt blue is a cool, slightly desaturated blue color, historically made using cobalt salts. The world leading manufacturer of cobalt blue in the 19th century was Blaafarvev?rket in Norway, led by Benjamin Wegner.

coffee mugs
(coffee mug) a mug intended for serving coffee
A mug is a sturdily built type of cup often used for drinking hot beverages, such as coffee, tea, or hot chocolate. Mugs, by definition, have handles and often hold a larger amount of fluid than other types of cup.

glass
A hard, brittle substance, typically transparent or translucent, made by fusing sand with soda, lime, and sometimes other ingredients and cooling rapidly. It is used to make windows, drinking containers, and other articles
A thing made from, or partly from, glass, in particular
Any similar substance that has solidified from a molten state without crystallizing
a brittle transparent solid with irregular atomic structure
a container for holding liquids while drinking
furnish with glass; "glass the windows"