Limeworks:

If you are looking for Silicate Mineral Paints in Pennsylvania, try .... www.limeworks.us

Biofa:

If you are looking for Natural Paints in Europe, try .... http://www.biofa.com/int/index.htm

ArtSeek:

To meet Artists and their Work, go to .... http://www.artseek.com/resources/artsupply/index.html

If you are looking for natural paints in the Netherlands, try www.schilderkunst.opzijnbest.nl