or backpack

Cannot hang on built-in refrigerators

The battery pictogram is printed on strong magnetic foil with red UV ink

as other surfaces may fade using these sponges

Ferrofluid - Magnetvæske til eksperimenter (10 ml.) Auto-translated (SE) or backpackFerrofluid is a ferromagnetic liquid that creates the most beautiful patterns when poured on top of a magnet. Contents: 10 ml bottle. NOTE! Remember to use a thick piece of glass or similar between magnet and ferrofluid so you can reuse the fluid! The liquid contains small ferromagnetic particles (magnetite) that are so small that they cannot be seen with the naked eye (a few nanometers in size). The particles make the liquid react strongly to