Chip, in which issue of RCR was your letter printed?? Never mind, I found it, the May issue. Love Winch's answer. There is no synthetic used today that has a higher flash point than Castor oil like he says. Castor burns and leaves and ash hard enough to scratch chrome???? Oh, puleeze. It leaves CARBON and the only carbon that hard is Diamond. Maybe we have little diamond makers mounted on out airplanes. Hey we can all be rich. I'd sure like to see that ash. I could use it for a grinding compound with my lathe.