Hey guys, just wondered what are some things you look for when picking out a rack of babybacks? I have been buying mine from the local grocery store that supposedly has the "best meat in town." But I have gotten a couple racks from there and noticed an off color tint to a small spot on the top. When cooked it turns a dark grey color and does not look very good. Anyone know what this is? I'm still pretty new at this so what should I be looking for when choosing a rack? Thanks for the advice!