The 3M 616 Ruby Red Lithographers Tape is a transparent tape made up of unplasticized polyvinylchloride and having the other side coated with adhesive rubber resin.It is a clear tape and does not allow light rays to pass through it, which makes it qualified for MIL-T-40620AThis transparent lithographers tape features pin-hole free backing blocks light and reduces retouching to produce quality photographsThis 2.4mil UPVC film tape is mostly used in lithographic stripping application in graphic arts industryIt is apt for processes like film splicing, photo-splicing, opaquing, edging, striping, light blocking, and negative splicing