Playing with the DangOreus mod and trying to make it so that rainbow ore is the only ore that spawns on the map, but it still spawns the other ores even when i disable them in the map generation config? How do I make it so that I can turn rainbow ore into normal vanilla ores without them also spawning alongside it?

Just realised that I need a chem plant from the start of the game also for this to work... hmm

That sounds like something you would need to ask the dangeOreus dev to accommodate, if there isn't already a way to disable vanilla ores with that mod. All this mod really does is add a new ore type.

Chem plants are unlocked pre-red science when this mod is installed, so you can easily do a rainbow only start.

Wouldn't I need a way to convert rainbow ore into iron/copper/coal first to be able to obtain the materials required to create a chem plant though?

You can handcraft the conversion for iron, copper, stone and coal. It was briefly impossible to get oil in 2.0, but that's fixed now and a full playthrough is possible.

Also as for the dangeoreus mod, it seems to be using each resource that has an auto place defined for Nauvis. To allow excluding ores, they would need to check if the relevant ore is enabled in map generation settings first. Nothing I can do on my side to help with that unfortunately.

Ok thank you! I've contacted the mod author about compatibility. Thanks for the quick replies and your help :)