So about that Superwash wool...
Since I couldn't do a felted join, I went ahead and did a good, solid tie.
Or...I thought it was good and solid.
Looking at the spot on the scarf where the knot was, I noticed today that it was coming untied. YIKES! How do I keep it from coming loose? I tried pushing the ends of the knot through to the other side of the scarf, but they just pop back through before too long. I'd already joined and continued knitting when I posted about my inability to felt, so I was unable to try the couple of great suggestions that were offered. I'm just all paranoid it will come untied now. :-(