Years ago I worked at a LHS. One day, a couple of customers were having a heated discussion about the correct shade of XYZ Railroads' Boxcar Red. At the other end of the counter, another customer was chuckling to himself, mildy amused at the discussion. After the two argumentative types left, I asked the other guy why he seemed to enjoy that so much. He replied that he had once worked in XYZ Railroads' paint shop, and they painted 'em whatever color was in the can - which was usually purchased from the cheapest supplier du jour. The shade of red would vary from supplier to supplier and sometimes from can to can.