Fulling Mill Woolly Bugger - Black / Green

Two colours a fish can find an edge between

Neither colour is doing the work on its own here. What a fish picks up is the hard edge where a dark body meets a bright tail, and that boundary stays visible in water where a single-colour fly turns into a smudge. It is the reason this combination keeps producing across species and conditions rather than in one narrow window. Throw it anywhere, strip it at whatever speed gets a response, and change the speed before you change the fly.