Marking blue — Marking blue, layout stain or Prussian blue is often a dye used in metalworking to assist in marking out tough elements for further more machining. It is usually identified as Dykem (immediately after a well-liked brand). It truly is utilized to stain or paint a metallic https://local.google.com/place?id=ChIJIQLm6dOjEmsRjWAs5E7Fr3o