Not convinced "Ooze" and "Red Ooze" are separate colours, needs to be checked
Ooze looks brown, but could just be lighting. - Generic oozes are indeed brown, Red Oozes are a red-violet colour. Additionally, the generic ooze mini icon looks like itself, but the Red Ooze mini icon looks like a black ooze.
Also Chromatic Ooze has a lot of weird little black dots in the picture...
Drop the Mini Prismatic Ooze in the arena, take a picture, run away.