Graphite/Blue PencilThings Select Indelible Copying Pencil. 12 Pack

PencilThings Select prototype Indelible Ink Pencil - Graphite Blue indelible aniline dye lead. Characteristics comparable to the discontinued Eberhard Faber Mongol colored indelible pencils. PencilThings Select Indelible Graphite Blue Ink Pencil lead writes as if it were an ordinary blue color pencil, but it is indelible. If you write very lightly and erase very carefully with a vinyl eraser in a dry environment, the markings will erase. The indelibility is due to the dyeing of the surface written upon, which is "fixed" by writing firmly, by the rubbing action of mechanical erasure, and further intensified by dampening or exposure to humid environments (your "hot, foggy" breath close to the markings will do). Writing on a damp surface immediately fixes the dye. This lead breaks a little more easily than standard pencil lead does. The aniline dye component weakens the lead slightly as compared with usual clay/graphite leads. We suggest sharpening it to a short point, rather than a long one. (The larger 11mm hole in a two-hole hand-held sharpener gives a nice tip.) The body of our finished product will be round, which assists you in continuously turning the pencil during use to keep the lead pointed. The lead and pencil are manufactured in the U.S.A.