Pencil or crayon suitable for erasure in copying paper recycling machine

摘要

Solid writing medium, based on high mol. organic substances used as binder for toners in dry electrophotography, is used for drawing lines on an image-receiving and carrier element formed (partly) from paper-like layers based on cellulose fibres. The lines are removed by dipping in an aq. erasure liq. and then passing through erasing rollers, which remove the lines by exerting heat and pressure. Also claimed is the method of erasing lines from the solid writing medium.