I have a 4" Diamondback in .38 special mfg. 1969 that had some light rust spots on right side of barrel and cylinder. I have removed the rust using instructions I received here (thanks guys). Looks much better! /forums/images/graemlins/smile.gif I'm thinking of sending it to Colt to have it re-blued so right side is perfect like the left side. My question is about the blue. It seems that I have seen 2 different blues. One is the regular blue that I have seen on many (and on mine) and the other looks almost black. Are there 2 different blues and will I have to specify to Colt?