I've heard that some dealers (mainly from the major coin advertisers) dip
coins. Supposely dipping is different from cleaning coins. A year ago I
bought a 1934-2006 Lincoln cent set in a Dansco album labeled 1909-2007. I
was missing 70 coins from 1909-1933. I've been buying them from various
dealers but wondering what the effect of dipping is. I've read that dipping
can make an ef/AU coin look UNC+. Comments?

dennis