Could you also add reaction classes for specific dye colors like [REACTION_CLASS:DYE_BLACK]? I was planning to add them myself for usage in my painted wood and sandstones mods to enable crafting by specifying all dyes of given color as a reagent instead of individual dye, but it would make more sense to have that be included in the mod that focuses on adding utility reaction classes.

Great idea with the reaction classes! I made sure to also include the DYE reaction class in my own mod Underground Tree Dyes .