BLUE FROM GREEN AT NIGHT, TO DISTINGUISH:
To distinguish blue from green at night, use either the light of a magnesium wire for this purpose or take a number of Swedish (parlor) matches, light them, and as soon as they flash up, observe the 2 colors, when the difference can be easily told.
BLUE (BALL): See Dyes.
BLUING: See Laundry Preparations.
BLUING OF STEEL: See Steel.