I have Revell-Monogram's Pro Modeler 1/48 version of the the Me 410--which is the direct descendant to the 210. It is in storage, so I cannot access it to get the color reference guide. I remember though that the interior color is RLM 66 Dunkelgrau, which is a dark gray, and the underside was a very light blue color--RLM 76(?) Lichtbleu. I do not remember the topside exterior colors....they were mostly painted with a splinter pattern camoflage composed of grey-blue and grey-green colors. Can anyone else help with the specific topside camo colors and reference numbers???
You might try Squadron/Signal's "Me 210/410 in Action" book--for color and painting reference. The "in Action" series is an excellent and affordable reference guide.
Good luck and happy modeling!