Ah, thanks for the reminder Christine! I meant to reply to Mirjam yesterday but it completely slipped my mind.
Mirjam, I emailed the makers of the Bamboo yarn I just used and this is what they had to say:
"We recommend hand washing the Bamboo and then laying it flat to dry. To block your garment, just spray the bamboo down and lay it out. We do not recommend ironing."
So that is what I did. It feels dry at this point but the strange thing is that the color seems a little darker where I sprayed it more heavily (along the edges and corners). So I'm letting it rest on the blocking board until I need to move it on Friday. It was a little less expensive than the yarn Christine bought, $15 for each skein. I also used 3 skeins for a total of $45 with a good bit left over. It is lovely yarn though, and I can't wait to wear my shawl this weekend!
LauraJ