That won't harm any future inhabitants. I guess AGA does not do colors anymore. I will paint the back of the tank, but what about the overflows? Is there any safe paint I can use so you can't see behind them also?
Last I saw AGA still does the overflows in black. I painted by back black and from a distance you really have to look to determine that there are overflows in there. As for other colors, I have no clue for painting plastic.