TUF 7: Colours
TUF 7: Colours
Colour is all around us, so here are some facts about colours.
- In ancient times, colours were created by crushing different substances – mineral, vegetable and animals.
- The colour red was created using iron oxide.
- The color yellow (khenet, kenit) was created by Egyptian artisans using natural ochres or oxides.
- The colour green could be produced from a paste manufactured by mixing oxides of copper and iron with silica and calcium. It could also be derived from malachite, a natural copper ore.
- The colour blue (irtiu, sbedj) was made combining iron and copper oxides with silica and calcium.
- The colour purple was created from a dye made from the mucus glands of a tropical sea snail, the murex (porphyra in Greek, purpura in Latin). The dye, and the cloth made from it, was so famous that the Greeks called the land of Tyre and Sidon (equivalent to modern Lebanon) Phoinike, “the land of the purple”. It required 250,000 shellfish to produce one ounce of purple dye.
- The colour white was created from chalk and gypsum.
- The colour black was created from carbon compounds such as soot, ground charcoal or burnt animal bones.
- Sunlight reaches Earth’s atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth’s atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
- A history of Crayola Crayon colours
- Night vision goggles are shaded in green as the human eyes are able to distinguish more shades of green than any other colour.
- 8% of the world’s population have blue eyes.
- Owls are the only birds who can see the colour blue.
- Seeing the color red can make your heart beat faster.
- In some countries, taxi’s are commonly yellow. This practice began in Chicago, where taxi entrepreneur John D. Hertz painted his taxi’s yellow based on a University of Chicago study alleging that yellow is the color most easily seen at a distance. This idea has also been used with school buses and road warning signs.
- Yellow is an appropriate colour for a room used for studying because it has a stimulating effect on the mind.
- Why post-it notes were originally yellow!
- The soccer ball first got its famous black and white markings for the 1970 World Cup in Mexico. This ball was called the Telstar and it was developed to help people see the ball more clearly while watching on television. Televisions in 1970 were mostly black and white, and a ball without markings could be difficult to identify.
- Opals can express every color in the visible spectrum.
There are many, many more facts about colours, go have a search!
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