Proper selvedge jeans

Not if sanforised. I believe some people's ass and nut sweat is simply more acidic than others. My ass and nut sweat checks in at pH7 so I have never ever experienced this problem myself....only some bad stitching on some Denhams once.

And Tom...you want grey? The Gustin slate is amazing if you're willing to take a punt and it works out.

I like the look of Gustins and how it works. I'll keep my eye out.