As Johnny Carson would say, “that is some wild and crazy stuff.”
I'll pull out the original documentation in a follow-up post (from E.D. HOwe's Mormonism Unvailed, a book I have, p. 187)... but Joseph Smith said that the devil once "appeared to him in the same form" as an angel had once told Mormon apostate Ezra Booth.
Booth said that the angel came "as having the appearance of a 'tall, slim, well built, handsome man, with a bright pillar upon his head.'" The devil then supposedly appeared to Smith "in the same form, excepting upon his head he hada 'black pillar,' and by this mark he was able to distinguish him from the former."
So Smith claimed another distinguishing mark was the color of the pillar (bright vs. black).
It's interesting that Smith apparently conceded the devil appeared to him. All it would have taken was a Gal. 1 "angel of light" proclaiming another gospel -- and obviously Smith was easily taken in.