Powder blue is a pale shade of blue. 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. Powder blue was also used as a colour name in English in 1774, but the exact colour is unclear: it may be a blue-grey or a dark unsaturated blue.