Wasn't sure if this should go in Painting or carpentry headings? How or can grease marks from door hinges be stopped? Or wot can be done to help reduce it.
I never said use it, just that, that is probably what it is, as black line under the hinge, very common as a problem, a good lubricant is furniture polish, it doesn't stain or leave nasty marks, also good on draw runners.
Never greased or oiled a hinge......its Metal rubbing metal dust. Leaves a black sooty mark next to hinge