You're going to have some color with persimmon. Brownish, grayish, cream colored to jet black is common.
Just rough your bow out and take in the house for 6-8 weeks. Store horizonally if possible. And buy a digital humidity gauge (about 6 bucks at Wal-mart). Try to keep the R/H around 45% if possible.
To take the twist out of your hickory bow just heat your limb good and put in a padded vise and twist the oppisite direction. Twist further then needed and bring back to straight. No need to clamp in place (until it cools) if you do it like this. If your other limb is straight then you still want to apply to same amount of heat to it as you did the one you straightened. This is important because heating can often raise the compression strength and you certainly want both limbs to have the same strength. Good luck.
ART B