Hi everyone. I just recently refinished the floors in the sunroom and now I'm doing the rest (dining room, living room and a bedroom). I have sanded the floors three times with grit 36 and, while the old polyurethane is gone, the wood looks of uneven color. I know how it is supposed to look (like in the sunroom), but I see at least three different colors (salmon, light orange and pinkish-white). My question is: how many times is one too many sandings with aggressive grit? Will the appearance improve as I switch to higher grits? The floors are about 100-120 years old. It's tongue and groove, but it's an inch thick. It's fir. I've shaved about a tenth of an inch--perhaps less than that. See pics attached. Pic 1 is the current job. Pic 2 of how they're supposed to look once refinished.