Reddish, brown and yellow earth pigments from a clay mountain in my village.
You can see the place and the process with data about the mesh sizes and comparison of the corresponding particle size.

Sorry for changing the colours in the middle of the process. I was experimenting and I didn't have footage of every step with one colour.

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My music:
   / @robsanx  

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00:00 · Intro
00:11 · The place
01:18 · Wet sieving
07:00 · Mesh size test
07:11 · Removing excess water
08:35 · Drying
11:18 · Dry sieving
13:25 · The pigment powder - End result
13:41 · Test on wood - Oil + pigments
15:51 · Test on paper - Mixes