The vertical stud is from the 1950s, and most likely has not been exposed to sunlight for much time. The vertical wood on the lower end is from a repair I did about 10 years ago, from the other side of the wall. It's backing for a sheetrock repair. The wood probably had seen some sunlight and was most likely just stuff I had around the shop. The vertical wood at top is new material, bought at the lumber store the other day. Photo taken with no flash, sunlight in the window and incandescent in the room.
Same as above, but with the camera flash on.