Archive of the former Yahoo!Groups mailing list: MOTM

Sorry if this is really basic but could any one please tell me if I
need to be concerned about tarnished finishes on RoHS pcb's. The ones
in question are about 6 months old and not soldered yet but have been
stored in airtight bags. I do avoid touching the surfaces with my
fingers but are they still usable? Also, even once soldered do RoHS
pcbs become tarnished once exposed to air.
Thanks in anticipation
Kerry