Synthetic hair and rust
Has anyone else noticed how stainless hook flies tied with synthetic hair (Ultrahair, Congo Hair, Super Hair, etc) tend to rust? Even if they've never been wetted, sitting in a fly box in a humid garage the s/s hook eyes and shanks will take on a rusty coating, and the hair will discolor. Even saltwater doesn't do this to them using real bucktail. Is this some sort of chemical or galvanic reaction? I kind of like tying with synthetics, but it's just not worth it if my flies are going to rust before I use them.