Dictionary Definition :
Definition[1]
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The five primary colors, also called 五正色 (or 五大色): 靑 blue, 黃 yellow, 赤 red, 白 white, 黑 black. The 五間色 or compound colors are 緋 crimson, 紅, scarlet, 紫 purple, 綠 green, 磂黃 brown. The two sets correspond to the cardinal points as follows: east, blue and green; west, white, and crimson; south, red and scarlet; north, black and purple; and center, yellow and brown. The five are permutated in various ways to represent various ideas.
Source
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A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
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(雜語)青黃赤白黑為五色。亦曰五正色。亦曰五大色。又緋,紅,紫,綠,琉黃為五間色。行事鈔資持記下一之一曰:「言上色者總五方正間:青黃赤白黑,五方正色也;緋紅紫綠琉黃,五方間色也。」各色配方位,則如圖。##【圖像: T0027.JPG 刪減】
Source
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丁福保《佛學大辭典》