Answers

2015-07-14T14:50:36+05:30
Yes,they used colours available in nature like green colour from plants and brown from dirt.
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2015-07-14T16:04:18+05:30
Prehistoric humans used to paint the walls of caves, oracle bones and tablets. The paint used for painting was made from ground-up earth and rocks, probably mixed with animal blood and fat. Here, you can clearly see the items they used can be found in nature, I do not have to mention it.
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