Thermal Reveal Card
A travel club's membership pass for the Hidden Coves of Aruna, printed in thermochromic ink. Warm it with a thumb and the dark ink runs through violet, magenta, orange and yellow before it clears, revealing a hand-drawn map of islands, a dashed route and three coves marked with an X; the warmth fades behind the finger. Drag beside the card to tilt it and move its gloss.
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React Native · Expo SDK 52+, TypeScript
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