Resurrecting an old thread, but always a relevant one.
I know most people don't have sulfuric acid lying around, but it's highly effective on all of the I. nil I've tried it on.
Soak the hard black seeds for 20 minutes in a very small amount of concentrated sulfuric acid.
Dump into large volume of cold water. Rinse thoroughly and soak the now brown seeds in water.
24 hours later
3 days later
