Yes I bought a jar of graphite powder to try, thanks to you and Hannah for the heads up on rio's.
Mine also came with leads, my seller said 'banana to alligator' if you happen to need them. I guess they just come with them, I wasn't sure.
So as far as heating, I can't find much since all the links are for buying a heater lol. But I think if you're in the frozen tundra like me it can only help. I did find this page with temps
http://gaterosplating.co.uk/Hints-and-Tips.php
I have a few tiny heaters for bettahs i can use.