Outside my building, someone has spray painted the letters USAF with blue paint. The snow under the paint has melted putting the letters in relief. How come?
I am assuming they painted USAF in blue on the snow. When the sun came out, the white snow, since it reflects essentially all wavelengths of light, did not absorb very much energy from the sun and therefore did not heat up and melt. The snow painted blue, however, would absorb most wavelengths of light (absorbing green and red energy is what makes it look blue) and this absorbed light is transformed into heat, raising the temperature of the snow and causing it to melt. Therefore, where the blue letters were, the snow would melt away leaving impressions of the letters.
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