They told me it was GNA too, which I'm sure (after asking about) is a metallic. Unless my normally good eyesight is failing me, the black bits on my car are not. Karl got the code from Renault after much faffing (by Renault not Karl!), and they said it is 694. I havent got round to finishing the small chips I was fixing, but it looked ok at the time.
I guess be careful before you try anything!