Quick update. After stripping with Klean-Strip (x2) and getting smoked out of the basement I used Citristrip. This morning I spent the better part of 4-5 hours with 220 and 320 grit sandpaper. Cleaned with mineral spirits and decided to call it a day. After dinner I decided to re-apply a coat of iron nitrate and then blush. While blushing, little bubbles were popping up anywhere there was end grain. Used gray scotchbrite and mineral spirits again, that’s when I took this picture. Think I’ll let it sit until the morning and do one more round of iron nitrate. It is much lighter this go around after stripping, etc. I think the sealer is preventing the new stain from making it too far. Thank you all.