Magnetic sketcher

Under the transparent foil, there are microscopic iron filings floating in a special solution. Moved by the magnetic force of a magnet, the filings attach to the foil. The magnet in the shape of a strip on the other side of the board is used for erasing your doodles.

The screen of the board is divided into hexagonal cells to avoid drawing all the solution in one place. The paraffin oil is the solvent here, and the magnetic material consists of iron file dust or, better, iron oxide. The iron oxide, the magnetic material of the first Chinese compasses (which was discovered in Europe by sailors from the Italian town of Amalia) is called magnetite.

The magnetic sketcher is a newer version of the old game of drawing moustache on the grandmother's picture. In that game the iron filings were a little bigger. And the pen was a little magnet. Be careful not to make a hole in the foil when using the pen.