so i spent about a hour and a half in my freezing garage after work today cleaning the bark and cambium off this red elm stave and when i got done i find these patches of discoloration

i haven't used elm before and just want to know if this is something i should be worried about.
the discolor looks to be only about a 1/8'' deep and then returns to being typical white sapwood underneath (sorry i don't have a pic of this the lighting wasn't good enough for my camera to pic up)
goal is only 25-30# at 28''

