SWIM has an old pot of MHRB that's depleted of DMT and has been sitting for about 2 months with xylene in it.  SWIM looked at it today and noticed the xylene was still clear.  Shouldn't the xylene have some color to it? Whenever SWIM does DMT pulls the naphtha will have a yellow hue when it's ready to pull.  Should SWIM just do a pull anyway and see what shows up on the pyrex?