Know your knots! With this free video tutorial, you'll learn how to tie a blood loop dropper fishing knot. When making a blood loop dropper knot, you'll have to twist several times to build up knots on either side of your loop. The knot is easy to tie provided, of course, you know how to go about making it. For an easy-to-follow, step-by-step overview of how to tie this useful fisherman's knot in a minute's time or less, watch this free video knot tyer's guide.