Mordant

Where can you buy this stuff?

Earth Guild in Asheville. http://www.earthguild.com/products/dyes/dyemord.htm

You might be able to find better pricing, if you search the web. Google Mordants.
Good luck!
Leah

Here’s a couple of articles about alternatives to buying mordants:
http://yourehistory.wordpress.com/2007/06/05/natural-dyeing-alternative-homemade-mordants-alum/