Mechanical Watch: Exploded View

I’m sure you have though about it already, but if you had a way to modify the refractive index of the resin, you could make the fishing lines disappear completely.

I never gave that any serious thought. What additives would do that, do you think?

Edit: A quick search reveals that there is quite a lot of prior art from the optical community. Darn, maybe I'm not done here.

You can use index matching fluid to determine what the nylon line is currently at and then use the fluid to experiment with epoxy droplets containing various amounts of low index additives like MgF2 nanoparticles or something :)