2:4-Dimethyl-6-ethoxyquinoline, otherwise known as the chemical dicyanin (not to be confused with the trademarked brand). This is an original set of vintage red cyanin dye goggles from the world war 2 era. True to the internet legend these have a knob on the front which can switch them between the red and yellow tint. True to the legend these were issued for a very short time to WW2 gunmen but not the pilots and quickly abandoned shortly thereafter. True to the legend they were originally designed to prevent incendiary rounds from ruining the gunman's natural night vision. THIS ...