This addon is cool. I hope that it develops well.
Suggestion: Synthetic Paint/dyes, that can be used in-place of any dye. Including the production of Titanium Dioxide for the White paints/lighter paints, and an ore, likely Ilmenite, that can be processed into Titanium Dioxide (and byproducts). However, this would not break GT balance, as the titanium would still have to be separated from the dioxide via whatever process, and an industrial blast furnace is still required to produce the titanium ingots, if a user wants to do that. It would just make the raw form a bit more common, but that is nothing to worry about (as using different mods/addons that add their own ores, including multiple types of Copper/Tin, even some Aluminum and others, does not break balance via adding more ores).
Add some ore contains TiO2 and can be used as white color dye
And after centrifuge/electrolize you can get TiO2
TiO2 will need 2500K with 2hydrogen in the GT blast
PS: In my server explosives are banned, so it's painful to look for the only ore contains Ti