Did you notice any blue ink on the butt before you rubbed it? If you put mustard on the butt and it mixed with blue ink you would have green. That's about the only way I could explain it.
It's amazing what one sometimes remembers when some days one can't remember <STRIKE>her</STRIKE> one's own name! Here's something that touches on the green meat:
*was not peeking* I had to start the cook during a down poor this morning so the internal heat gauge was added after the rain stopped. The green is now a nice brown so I'm not going to worry about it.