http://www.buyartsuppliesonline.org/glass-blue/
what colors are absorbed by dark blue glass?
what colors are transmitted by dark blue glass?
Items appear to be a certain color, because they absorb all light, then emit that colour of light that they appear to be. For example, grass absorbs all bands of light but is emits the green, making it appear green.
Therefore, Dark Blue glass will absorb all bands of light (all colours), but it will then emit the dark blue colour, that you see. This is because the light gives energy to the glass, which excites the electrons in the glass. The electrons then rise to a higher energy level. As they lose this energy (they lose it almost immediately), the electrons will emit the energy as the dark blue colour that you see.
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