Also wear black clothes, with green, red violet color and supplement.

亦可穿纯黑色衣着，以绿、红和紫罗兰色作为补充色。

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Red and violet are at opposite ends of the spectrum.

红色和紫色位于光谱的两端。

《牛津词典》

The original preference for black was changed in the thirteenth and fourteenth centuries, as such colors as red, violet and purple came into fashion.

最初对黑色的偏好在十三、十四世纪改变了，因为红色、紫罗兰色和紫色开始流行。

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The autochrome achieved its color through a single glass plate smeared with millions of grains of potato starch, which were dyed red, green or violet and thus acted as tiny color filters.

FORBES: Magazine Article

The discover section of the site provides an insight into the science behind the study of Leonardo's work, including explanations and images of infra-red, ultra-violet and my favourite, the "computed axial tomography" of some of da Vinci's work.

BBC: 8bitpeoples

For your money, you get two platters and a mini-mixer, FX buttons, a choice of five colors (white, black, red, green or the pictured violet), as well as some built-in LED effects that help you learn to mix (the lights get brighter as the pitch of the two songs gets closer, etc.).

ENGADGET: Pioneer announces DDJ-WeGO two-channel DJ controller, provides entry-level jams