172K views · 3.9K reactions | Here’s a behind the scenes look at how we make pencils. | Interesting Engineering | Facebook
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FacebookInteresting Engineering
Thermochromic Pencils: some amazing pencils I found in the @exploratorium gift shop that exhibit reversible color change. The warm air from a hair dryer can quickly shift the color of these pencils, and then as they cool back to room temperature the original color slowly fades back in. The color change can also be achieved by body heat from the hand. The color change seen here most likely employs leuco dyes, thermochromic chemicals that have two reversible forms, one colorless when warmed above
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It's time to hit the books! 🚌 If you’re a student — or just love learning — go behind the scenes into the production of textbook bindings, highlighters, retractable ballpoint pens, pencils, staplers, and even school buses! Stream How It's Made on Discovery #ScienceChannel #HowItsMade | Science Channel
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Pencil Resistors | Science Project
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