Dear MaxQ: I knew what some of the processing steps were, but there was no clue as to how the name was chosen. For instance, part of the process is "aging". But I couldn't figure out where the "mar" came from. I even found a dictionary of Materials and somethiing or other Science, but it did not have it. I have a brother who from MIT as Mechanical Engineer went into Air Force and was Chief of Airborne Systems on one of the early rockets. He might know, but it'll take him a month to get around to answering.