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Tarnish

physical science Maturity 11-13

Some metals change color on top.

Wolfram evaporated crystals and 1cm3 cube.jpg
Wolfram evaporated crystals and 1cm3 cube.jpg
This can look gray or black. It happens when metal meets air. This thin layer helps protect the metal. It can even look green!
1899 reverse.jpg
1899 reverse.jpg
Do you see old coins with colors?

44 words
🖼️ Images & Media (2)
File:Wolfram evaporated crystals and 1cm3 cube.jpg
Wolfram evaporated crystals and 1cm3 cube.jpg
File:1899_reverse.jpg
1899_reverse.jpg
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📚 Content adapted from Wikipedia | Readability: FK 13.2 | Vital Level 5