"Natural pigments" refers to substances or materials found in nature that can be used to add color or dye to something. Examples include plant extracts, minerals, and even some animals or insects that produce colors. Full definition
All garments that are sold in the store are produced with organic cotton and died with natural pigments, free of harmful chemical products. (treehugger.com)
That preventive maintenance is in organic baby toys, which use natural pigments. (abckidsinc.com)
The work in the exhibition varies in medium from traditional oil and acrylic paintings to drawings that include graphite on paper, and ink and natural pigment on felt. (cb1gallery.com)