Pigment is the dry material which gives paints, inks or dyes their color! ALL KINDS of things found in nature can be dried, cleaned and crushed and ground down into powder pigment. The pigment is then added to a binder which makes the pigment stick to a surface such as paper, canvas, or ceramic sculpture!
Check out the video below in which 2 scientists from Denmark explain and show you examples of pigments that people in ancient times used to put color on sculptures, frescoes, paintings, etc... ( and it is cool to listen to Danish! :)