My aunt bought me a "magically magic Magic Pad" and the directions say you need a special pen to make "hidden" images appear on the paper. I don't have that pen, but I do remember a lab I did in my chemistry class where we had to expose a "clue" on a map and we were given a specific chemical to dab onto the paper to expose the point. Now I could see that there was another chemical on a point on the paper, and it seemed yellowish, and the same yellowish coat is on the pad's paper. If I know the chemical that exposed the point in the chemistry lab, then I can expose the pictures without buying the pen. (Which is in Germany.. and I'm in California)
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