Does the color blue come naturally without adding other colors to it in any way?

star_gazer

It is considered one of the additive primary colours. On the HSV Colour Wheel, the complement of blue is yellow; that is, a colour corresponding to an equal mixture of red and green light. On a colour wheel based on traditional colour theory (RYB), the complementary colour to blue is considered to be orange. http://www.kvafsavadi.net/tq/colours/colours_files/Page401.htm Oct 01 09, 12:20 AM

snuiteke

Blue is a colour, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 440–490 nm. It is considered one of the additive primary colours. On the HSV Colour Wheel, the complement of blue is yellow; that is, a colour corresponding to an equal mixture of red and green light. On a colour wheel based on traditional colour theory (RYB), the complementary colour to blue is considered to be orange (based on the Munsell colour wheel).[2] The English language commonly uses "blue" to refer to any colour from navy blue to cyan. The word itself is derived from the Old French word bleu. Pigments Traditionally, blue has been considered a primary colour in painting, with the secondary colour orange as its complement. Blue pigments include azurite (Cu3(CO3)2(OH)2), ultramarine (Na8-10Al6Si6O24S2-4), cerulean blue (primarily cobalt (II) stanate: Co2SnO4), cobalt blue (cobalt(II) aluminate: CoAl2O4), and Prussian blue (milori blue: primarily Fe7(CN)18). http://en.wikipedia.org/wiki/Blue Shades of blue http://en.wikipedia.org/wiki/Category:Shades_of_blue Oct 01 09, 12:37 AM

Zbeckabee

Yes, it does. There is a natural blue mushroom called Lactarius indigo, blue berries, indigo plant dyes, blue dyes that come from the woad plant, blue flowers and blue birds (see star_gazer), etc. http://en.wikipedia.org/wiki/Indigo http://en.wikipedia.org/wiki/Blue http://en.wikipedia.org/wiki/Woad http://en.wikipedia.org/wiki/Blue_Flower Oct 01 09, 8:01 AM