Wierd, 800W doesnt looks "colorful" at all. On my 887k white tees and white shirts get some blue effect on the lower part aftter couple of wears, It does get off on the laundry. Never had a problem with sofas, but I do have problem with every note or piece of paper I tuck in the back pocket and it comes off blue!
It's probably the darkest blue you can possibly get, looks black to me. Interesting info though...at least the transfer will wash out.