Gold Alloys Colors

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I just found out that there's blue and purple gold last night!?!?! Then found this thread today.

Anywhere, here's what I was reading last night.
 

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Can you tell me the title of the book... Or the link to download it. Thank you
He have not been on the forum since November last year so you might need to wait for a while.
Anyway if you zoom in in the image you will see references which may help you identify the book.
 
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