Here's a photo from a wet-plate negative I made last weekend at a reenactment near Natchez. The emulsion started peeling away after I pulled it out of the silver bath, so I had to frame the picture for the area that remained intact. More of the image started peeling away when I put it in the fix, so I had to do a hurry-up wash job and put it in the drying rack before I lost the whole image.
Lesson learned: clean the glass thoroughly before pouring the collodion.