I finally figured out what the 9th dyeable part on outfits changes the color of bullets and melee weapon particle effects.
>>545729665
There are two catches to that list. For the level 30 list two of enemies will drop the Typhon wedges and the other two will drop the Griffin wedges. This split appears once more in the level 65 list with the Covenanter wedges being divided up based on enemy element.