If we seek for the simplest arrangement, which would enable it [the eye] to receive and discriminate the impressions of the different parts of the spectrum, we may suppose three distinct sensations only to be excited by the rays of the three principal pure colours, falling on any given point of the retina, the red, the green, and the violet; while the rays occupying the intermediate spaces are capable of producing mixed sensations, the yellow those which belong to the red and green, and the blue those which belong to the green and violet.
Do not several sorts of Rays make Vibrations of several bignesses, which according to their bigness excite Sensations of several Colours, much after the manner that the Vibrations of the Air, according to their several bignesses excite Sensations of several Sounds? And particularly do not the most refrangible Rays excite the shortest Vibrations for making a Sensation of deep violet, the least refrangible the largest form making a Sensation of deep red, and several intermediate sorts of Rays, Vibrations of several intermediate bignesses to make Sensations of several intemediate Colours?
It would be quite amusing to preach a bit to all those people who for many years now have been looking at our paintings and either laughed or shook their heads reproachfully. They do not believe that these impressions, these instant sensations, could contain even the smallest grain of sanity. If a tree is red or blue, or a face is blue or green, they are sure that is insanity.
If we were to imagine an orange on the blue side or green on the red side or violet on the yellow side, it would give us the same impression as a north wind coming from the southwest.
It's untrue to say the colors I use are not those of reality. They are real: The red I use is red; the green, green; blue, blue; and yellow, yellow. It's a matter of arranging them differently from the way I find them, but they are always real colors. So it's not true that when I tint a road or a wall, they become unreal. They stay real, though colored differently for my scene.
Green, red, and mixed shades of haemins are known. If magnesium is replaced by iron in chlorophyll, green haemins are obtained. Their colour is due to a strong band in the red which is already recognized in chlorophyll.
Turning to the colour-classification methodology: The starting point are the four pure colours red, yellow, green and blue; their in-between shades and scales of brightness result in colour schemes containing 16, 64, 256 and 1,024 shades. More colours would be pointless because it wouldn't be possible to distinguish between them clearly.
Violet has the shortest wavelength of the spectrum. Behind it, the invisible ultraviolet. Roses are Red, Violets are Blue. Poor violet, violated for a rhyme.
The first of all simple colours is White ... We shall set down White for the representative of light, without which no colour can be seen; Yellow for the earth; Green for water; Blue for air; Red for fire; and Black for total darkness.
The colours red, blue and green are real. The colour yellow is a mystical experience shared by everybody.
Colour-blindness always extends to the complementary colours. Those who are red blind are also green blind; those who are blind to blue have no consciousness of yellow. This law holds good for all mental phenomena; it is a fundamental condition of consciousness.
It will be readily admitted that brown tints have never coursed beneath our skin; it will be discovered that yellow shines forth in our flesh, that red blazes, and that green, blue and violet dance upon it with untold charms, voluptuous and caressing.
The Olympic flag [] has a white background, with five interlaced rings in the centre: blue, yellow, black, green and red []. This design is symbolic; it represents the five continents of the world, united by Olympism, while the six colours are those that appear on all the national flags of the world at the present time.
For 'tis green, green, green, where the ruined towers are gray, And it's green, green, green, all the happy night and day; Green of leaf and green of sod, green of ivy on the wall, And the blessed Irish shamrock with the fairest green of all.
What is green? The grass is green,
With small flowers between.
What is violet? Clouds are violet
In the summer twilight.
What is orange? Why, an orange,
Just an orange!
Nearly all edible seaweeds - or 'sea vegetables,' as they ought technically to be called - belong to one of three broad groups: green, red and brown algae.
I would stand transfixed before the windows of the confectioners' shops, fascinated by the luminous sparkle of candied fruits, the cloudy lustre of jellies, the kaleidoscope inflorescence of acidulated fruit drops - red, green, orange, violet: I coveted the colours themselves as much as the pleasure they promised me.