Hand Warmer Question

[paosparti.livejournal.com]

I've just come into a lot of upholstery fabric and I'm thinking of making a bunch of those warmer pillows and hand warmers like the young lady posted here the other day.

I offhandedly mentioned this project to my horticulture professor (because I was talking about walking over to the feed store that is next to our classroom to get some of the feeder corn for filling) Where-upon she knitted her brow and said that she didn't think the corn or flax seed would be a good idea. and I asked why it was the filling most commonly recommended on the web. She started talking about how lax seed and corn have high oil content and she would worry about the oil in the going rancid and spoiling the pillow.

She said that Rice doesn't have much oil so it would be a good choice, and she also brought up buckwheat hulls. I have buckwheat hulls I just didn't know if they could be used and would retain heat like the rest.

Any of you have any comment on any of this? Thanks ahead of time.