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primary colours are the colours of the rainbow( VIBGYOR).Now White is made by mixing all the colours of the rainbow and black is also made by by mixing some colours present in the rainbow.so the colours present in the rainbow are primary colours and all the other colours in the world are made by mixing them in someway.Secondary colours are not naturally present. .....................................Gho$t
iodine
There is rust present.
cells of the green coloured parts of a plant
Its a standard colour used to represent uniforms. Like how everything in the present wold has common colours and symbols to identify certain things, having white coloured uniforms are commonly accepted around the world.
Blue and green.
There is no suffix. The root word is "color."
The present perfect of "color" is "colored." For example: "The walls have been colored blue."
See this link.
sodium
Alluminium
Stars derive their colours from the elements present.