Body Grey (clear also works) (midge size Liquid Lace)
Markings Black markings (Sharpie, one dot at each end)
How to tie it
Lay a thin blue dun thread base on a size 16 curved nymph hook. Thin is the operative word. A glassworm is almost transparent, so any bulk underneath ruins the illusion.
Prepare the Liquid Lace by touching a lighter to the end and pulling. That flattens it and leaves a thin tag you can tie in without building a lump.
Bind the Liquid Lace in with tight wraps at the back, squashing it down, and keep the underbody smooth all the way forward.
Mark a small black dot at the rear of the body and another at the front with a Sharpie. Those two dots are the head and tail spots that make an otherwise clear fly read as a Chaoborus larva.
Give the Liquid Lace a good tug to even it out and wrap it forward in touching turns.
Secure with a couple of tight wraps, pull, trim and go straight into a whip finish.