Intensely blue, soft, uniform paste that spreads easily and evenly to show high spots on bearings. It's most valuable when used on flat bearing surfaces of lathes, planers, milling macines, etc. A thin coating may be left on the surface day in and day out, and will not dry out. The film remains "wet" and "transferable", and in condition for months. No night clean-up or morning rebluing is necessary. Non-hardening. Transfers from one surface to another. Saves valuable time and money in surface scraping work