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Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue coloured glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour.
Glass containing two or more phases with different refractive indices shows coloring based on the Tyndall effect and explained by the Mie theory, if the dimensions of the phases are similar or larger than the wavelength of visible light. The scattered light is blue and violet as seen in the image, while the transmitted light is yellow and red.
It was also used as colorant, particularly in blue glass and as the blue pigment used for centuries in Chinese blue and white porcelain, beginning in the late eighth or early ninth century. [15] Cobalt glass, or Smalt, is a variation of cobalt blue. It is made of ground blue potassium glass containing cobalt blue.
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Powder blue is a pale shade of blue. [1] As with most colours, there is no absolute definition of its exact hue. Originally, powder blue , in the 1650s, was powdered smalt (cobalt glass) used in laundering and dyeing applications, and it then came to be used as a colour name from 1894.