color code for 293 alloy wheels?anyone?

[siscobmw]

Hi!
during my sunday trip I got a ridicolously small stone chip on the left rear wheel...
no damage and no problems, but there' sthe sign of this stone on the paint(3mm long wide about 1 mm, not deep)and I started to think about a little touch up with bmw paint sticks....but I don't know the colour....
looking at etk there are at least 4-5 "silber" kinds of paint for the wheels....
reflex sibler brilliant line, ferric grey.....mmh......anyone knows where I can get the information I need? my dealer looked at me like something between an idiot and someone from an other planet....
no urgency, but that little sign makes me not sleep at night....
thanks to everyone!
Francesco from Italy