SOLAR (TM) 100% Polyester ultraviolet threads.
Solar changes color from white to one of 7 colors -
yellow, orange, pink,, blue, coral, purple and
green when sunlight or an artiificial UV-light hits
it. Solar is guaranteed to change color through
approximately 2,000 exposures. Solar is available
in 1,100 yard mini-kings and is suitable to run on
designs using 40 weight thread.