I did it years ago. As i remeber I had to almost boil them to get the dye to hold. you can mix colors to get one that you like. Use a old aluminum kettle and do it outside because it is a mess. another thing if I remeber right we had to rinse the finished dyed material in a vinagar and water bath to fix the color. Do it hot and turn off the heat sorce. let it cool and watch to get the color you want if you want a darker shade. remember it should be a little darker wet than what it will be dry. hope this helps it is a science unto itself.

Redman