Pigments Sources

http://www.jcsparks.com/painted/pigment-chem.html
This website has a lot of information, especially on its artistic use and chemical properties. It covers various colors and their historical backgrounds.

http://www.eggtempera.org/index.php?a=eggtempera
This website is very historically oriented. Little info on chemical themes, but will serve a purpose.

http://reference.howstuffworks.com/pigment-encyclopedia.htm
Brief, but gives pigments in a nutshell.

http://www.lindapaul.com/about_egg_tempera.htm
Gives tempera painting in a context of art history.

http://wordnetweb.princeton.edu/perl/webwn?s=pigment
Has a clear definition of pigments.

http://davis.wpi.edu/~matt/courses/watercolor/properties.html
Tells about the basics of watercolor, which will be used to contrast with tempera paint.

http://www.ehow.com/how-does_4672330_water-coloring-work.html
How watercoloring works. Talks about binding mediums.

http://www.leadlawsuits.com/index.php?s=community
About lead in paint.