British Colour Standard Powder Blue No. 193
The origin of this name is not generally known. The term was in use in the
seventeenth century, and came from the French Poudre Bleu, an old name
for Smalt, which is powdered blue glass, the colour of which is due to cobalt.
The term, however, has deviated so much from its original meaning that a
separate colour is featured here for Powder Blue.
This is matched to samples submitted by textile and other colour using industries,
and will be seen to be a pale version of Smalt.
See notes on Smalt. (Don't worry, I'll post Smalt soon...!
Too good a word and colour not to.