OkoNorm Colour-Changing Marker/Eraser Pen, single
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For use with OkoNorm Magic Pens 9+1 and OkoNorm Felt-tip Pens 9+1.
The colour-changing marker can be used as secret inks, which only become visible after being painted over with the magic markers. Feature water-based inks with a faint odour.
Free from formaldehyde and other harmful substances
Made in Germany