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Pure gold is slightly reddish yellow in color, but colored gold in various other colors can be produced. Colored golds can be classified to three groups: * Alloys with silver and copper in various proportions, producing white, yellow, green and red golds; typically malleable alloys * Intermetallic compounds, producing blue and purple golds, as well as other colors. These are typically brittle but can be used as gems and inlays * Surface treatments such as oxide layers Pure 100% gold is 24 karat by definition, so all colored golds are less than this, with the common being 18K (75%), 14K (58%), and 9K (38%).〔 ==Alloys== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Colored gold」の詳細全文を読む スポンサード リンク
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