I recently bought some walnut wood in the ruff 4/4 sawed. When i bought the wood it looked fine when i got back to my shop and milled it i started to notice the color changed on some of the boards. In facted some of it look like it was white instead of dark like it was suppost to be this happened after i took of a 1/2" of wood i was not happy at all. and to top it off after i riped some of the wood down to smaller sizes it had a bow in it that it did not have before good thing i over sized it a little but i had to straighten it out then finsh cut . My guess what happen was there probley was some tension in the wood as for the color change beats me. if anyone has any idea or thoughs or suggestion to help me in the furture please post them.