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

Also on display are the tools the Magdalenians fashioned to hunt, make clothing and, yes, create colorful art using red, yellow, black, brown and violet paints made from minerals.

WSJ: Prehistoric but Far From Primitive | Cave Paintings of Lascaux | Field Museum | By Mark Yost