Why Does Glass Appear Green from the Side but Clear from Above?

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SUMMARY

The green tint observed in glass when viewed from the side, as opposed to its clear appearance from above, is primarily due to the presence of iron impurities in the sand used to manufacture the glass. Iron ions absorb light in the red and blue parts of the spectrum, allowing predominantly green light to be transmitted. This effect is more pronounced when viewing the glass edge-on, as the increased thickness of the glass enhances the absorption characteristics. The behavior of iron in the glass lattice contributes to this phenomenon.

PREREQUISITES
  • Understanding of light absorption and transmission principles
  • Basic knowledge of glass manufacturing processes
  • Familiarity with the properties of iron and its effects on materials
  • Knowledge of the electromagnetic spectrum, particularly visible light
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  • Research the role of impurities in glass production
  • Explore the electromagnetic spectrum and its interaction with materials
  • Study the effects of different metal ions on light absorption in glass
  • Investigate the glass manufacturing process, focusing on raw materials and their properties
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Students of materials science, glass manufacturers, and anyone interested in the optical properties of materials will benefit from this discussion.

Infrasound
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When looking at my computer table, I notice that when i look at the glass from above it appears to be clear/transparent to all visible colors, but when I look at the edge of the table, the glass appears to be some kind of green color.

Why does this happen, and why only this color?
 
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From:

http://uk.answers.yahoo.com/question/index?qid=20080308120406AAfKk3m

"The green tint is caused by iron, which is an impurity in the sand used to make the glass. In the glass iron ions absorb in the red (and infra-red) and blue (and ultra-violet) parts of the spectrum, making the glass look green due to the light that is left. As other posters say, you can see this more clearly from the edge because you are looking through a greater thickness of glass. ..."
 
Is this particular behavior of iron due to it being involved in the glass lattice?

I imagine that iron alone does not have a wide band absorption spectrum with just green being reflected/transmitted.
 

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