Reflecting on the spectrum of colours in gems can be very absorbing
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| Complete spectrum: light absorption for precious stones |
References: https://sassalina.wordpress.com/2012/02/24/reflecting-on-the-spectrum-of-colours-in-gems-can-be-very-absorbing/
21st Century Skills (၂၁ရာစု၏ ကျွမ်းကျင်မှုများ)
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