Quotation from: General Science

Written by: Bertha M. Clark


An emerald looks green because it freely transmits green, but absorbs
the other colors of which ordinary daylight is composed. A diamond
appears white because it allows the passage through it of all the
various rays; this is likewise true of water and window panes.


Stained-glass windows owe their charm and beauty to the presence in
the glass of various dyes and pigments which absorb in different
amounts some colors from white light and transmit others. These
pigments or dyes are added to the glass while it is in the molten
state, and the beauty of a stained-glass window depends largely upon
the richness and the delicacy of the pigments used.

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