Natural Science-

Green - colour of Christmas , of Islam , of nature , of life

1 . Introduction - History of Colour

Colour has been investigated and used for more than 2000 years Throughout the centuries , different civilizations have experimented and learned more about colour . We are still learning today about how colour affects us and its importance in our lives

The ancient Egyptians have been recorded to have been using colour for cures and ailments . They looked at nature and copied it in many aspects of their lives . Their deep knowledge and understanding of the healing powers

of the colour rays was so nearly lost when , later on in history the Greeks considered colour only as a science . Hippocrates , amongst others , abandoned the metaphysical side of colour , concentrating only on the scientific aspect

Some of the early studies and theories about light were done by Aristotle who discovered that by mixing two colours , a third is produced . He also discovered that light travels in waves . During the Middle Ages , Paracelsus reintroduced the knowledge and philosophy of colour using the power of the colour rays for healing

A pioneer in the field of colour , Isaac Newton , passed a beam of sunlight through a prism . When the light came out of the prism it was not white but was of seven different colours : Red , Orange , Yellow Green , Blue , Indigo and Violet . The spreading into rays he called dispersion and the different coloured rays he called the spectrum . He learnt that when the light rays were passed again through a prism the rays turned back into white light

The present research studies on of the most popular colours that is wide-spread in the nature - green

2 . Scientific aspect of Green

a ) Green in colour spectrum

Each colour of the spectrum has its own properties in the form of its wavelength and frequency (frequency terahertz (one trillion cycles per second wavelength nanometers , one meter equals 1 ,000 ,000 ,000 nanometers one nanometer is about the length of ten atoms in a row Green has following figures : wavelength - 570 - 500 nm , frequency - 580 - 530 thz

The color systems used by scientists and ordinary people are entirely different . We usually mix blue and yellow paint and get a shade of green a scientist mixes green and red light to create yellow

One should separate the two different kinds of color in the world First , there 's the color one can touch , such as the skin of an apple or a painted wall . These colors are part of the surface of an object . Next there 's the color one can 't touch , such as a beam of red light and the colors produced by one 's computer monitor . Colors generated by light are part of one color system . The tangible colors which are on the surface of objects or on the printed page are another color system Scientists recognize the light primaries of red , green and blue . When combined , red and green light rays produce yellow , blue and green produce cyan , red...