I just recently dyed two skeins, 50gm each, of alpaca yarn (from Blue Sky Alpacas) and one skein, 100gm, of wool yarn (from Lorna's Laces Hand-Dyed Yarns). All of the fibers are so lightly dyed to begin with that they didn't looked dyed at all, so I took it upon myself to change their look. I was hoping that since they had already been dyed that they would have already been premordanted as well. Only time will tell.
Henna powder in the pot - - & - - Simmering on the stove to extract the color
I love the color of the alpaca - it almost has a gray hue to it. Nice! The wool looks a little brassy to me, so I'm going to over-dye it with something else. I'm thinking of playing with indigo ;)