Erasion of writing on data cards - includes writing made with different colour and compsn. inks with only one solvent capable of fully erasing written data

摘要

The card contains two kinds of data writing made in coloured inks of different composition which in each case may only be erased fully with one solvent, but which are not soluble with the other solvents suitable for erasing the other colours. The solvent is kept inside a box container which includes a card dip frame with stays in bow shape and parallel to each other between which the data card fits during the erasion process. The dip frame is made in one piece, from metal with the stays shaped into parallel slots in it's centre area (3).