¡Tomodachi Iroiro(Iro Gawari Picture Book Furetemite Series)
¡Takai Yo Shikazu
Description
[Machine Translation] This book uses "Metamocolor," an ink that changes from black to colorless depending on temperature. The color disappears when the ink is heated to about 30 C (approx. body temperature or friction heat), but returns to black at 25 C or lower, allowing the user to play over and over again.
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