Question

From which sources (natural) green and yellow colours can be obtained if these are not available from the market?​

Answer 1

Green is the color between blue and yellow on the visible spectrum. ... Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage. Several minerals have a green color, including the emerald, which is colored green by its chromium content.

Answer 2

If looking for natural colours then the only way is to make them by using natural products like flowers or trees or leaves.

The green colour can be obtained from special type of leaves when dried up and made a powder out of, in case of using as a dry colour. If using as red colours then the extract of the leaves can be used.

Talking about the yellow colour yellow colour can be easily obtained from yellow flowers like sunflower marigold or even mustard flowers. Same like the green colour if to be used as dry colours the flowers are to be dried first and then to be made about route of and if to use for what use then the extract of the flowers is to be used.

For sure these two methods are the natural methods which can be used to obtain the colours for any use.