Remember that one thing that never seems to get a satisfactory explanation is why things are the colors that they are. We know what colors are, different wavelengths of visible light, and that most of what we see is a mix of color, and how colors mix together.
Transparency is easy to explain. If the atoms are lined up in a regular pattern, light can pass right between the atoms. If the concentration of atoms is sparse enough, such as in the air, light can also pass right through.
But that still does not give us much of an explanation as to why a red object is red and a blue object is blue.
So I decided to try myself to explain why things are the colors that they are. Here is a link to what I came up with:
https://www.markmeekphysics.blogspot.com/2012/07/atoms-and-color.html?m=0
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