Roger Hicks
Veteran
This is odd. Where does the image go? What attacks it? It's silver, after all.Unfortunately, yes. I'm speaking --well, typing-- from experience. Unless I didn't get the secret handshake club's manual (which is not improbable), you need to get it fixed the C-41 way.
Fix it a lot the way you've already done it. A lot. And it may last longer, but once developed this way I'm not sure if you can go back. In about three, four years, you'll see it.
I *think* if you take the uncut roll to a lab they may process it for you; this is what I was recommended I should do, and I still doubt it would work --don't know since I never tried it. Fortunately for me, the roll I did that with (and it was an accident, btw: I didn't pay attention that the roll I had grabbed wasn't TMax...I was batch-developing) was just a test roll.
I'm not calling you a liar. I've never processed either XP1 or XP2 other than as C41, and I can't really see why anyone would, so I've never paid any attention to its permanence or otherwise when processed arbitrarily in ways the makers never intended. But I'm intrigued.
Cheers,
R.