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OpenStudy (anonymous):

What Give synthetic rubies their color

OpenStudy (joannablackwelder):

The nutrient (material that will become the ruby crystal) consists primarily of extremely pure aluminum oxide (Al 2 O 3 ); approximately 5-8% of chromium oxide (Cr 2 O 3 ) must be added to produce the essential red color. Read more: http://www.madehow.com/Volume-4/Synthetic-Ruby.html#ixzz3APwixMlp

OpenStudy (joannablackwelder):

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