A "bleeder" fabric like this means that the dye was not set properly into the fabric. Washing with Retayne will solve this problem, although sometimes it takes two washings with Retayne to stop all of the bleeding.
Many quilting stores carry Retayne now, especially those that cater to dyers. Otherwise it is widely available online from places like Amazon, Dharma Trading, Pro Chem, etc. Here is a link to it on Amazon:
http://www.amazon.com/Craft-Retayne-.../dp/B001HZOZGW
There are other sizes available too.