I also bought Araya RM-17 rims and am perfectly happy. The seller wrote they are "super hard"; that is the greyish colour according to the catalogue. Also, it could be seen on the pics that there were no black Araya rims. If this had been the case, I would have bought them all! Clearly, the "black" only refererrd to the decal. I bought the ones with the "white" decals.
RobKleuskens, "what to do now"? Edit your message, say sorry, and sell the rims, if you cannot use them. They were priced attractively.