I'm glad to hear I'm not the only one who has tried this. I used to develop XP-1 in D-76 with excellent results. If your negatives come out too thin either increase the amount of chemistry in the mix or increase your development time. As I remember we had to develop XP-1 about 25 percent longer than recommended for T-Max 400. I still have the negatives and some prints from this combination.(posted 9273 days ago)