Any paint factor will mix up a pot of any colour imaginable. If ypu can get the BS or RAL number they can do it without a sample. Otherwise they will need a sample at least 25mm square.
If you can get a sample to compare with the BS and RAL colour charts are here (allowing for monitor differences). For example Boxford used 'Smoke grey BS 381 692' as their standard grey for their lathes until the 1970s.
Hope that helps,
Regards
Terry
Edited By Terryd on 28/10/2012 15:53:58