Updated December 31, 2019
Currently in stock is Firestar, a nylon product that adds a subtle shimmer/sparkle to your fiber. It takes at about 6% (by weight) to be definitely noticeable; more can be added if desired.
Colors are (from upper right, clockwise): red (sold out), natural, green, tropic
Firestar can be dyed, all colors are $2.50/oz.