How / from where do people get colours for paints such as?

Question

enamal, water colour, wall paints, fabric dye, plastic wares, paper.....etc

Answer 1

Start here: http://www.handprint.com/HP/WCL/pigmt1.html

It's a site called "how watercolor paints are made." Pretty interesting and detailed stuff with lots of clickable links. Much of the information applies to all paint manufacture. Maybe this page will give you ideas on where to get info on the other kinds of dyes and paints.