Here is an awesome essay/paper on natural pigments:
http://naturalpigments.com/education/article.asp?ArticleID=116
http://naturalpigments.com/education/article.asp?ArticleID=116
http://naturalpigments.com/education/article.asp?ArticleID=116
http://naturalpigments.com/education/article.asp?ArticleID=116
http://naturalpigments.com/education/article.asp?ArticleID=116
http://naturalpigments.com/education/article.asp?ArticleID=116
Trying to figure out how to smash these sea stones into pigment…..
