Just the subject I was thinking about. According to the dry fly theory you are supposed to float the fly but sink the tippet as it otherwise is more visible and could spook a fish. I often forget the whole thing but on clear calm water I rub with tippet with mud that is supposed to sink it. In any event I just found out flourocarbon sinks so the obvious question is whether anyone uses it for the tippet. If it pulls down the fly, can at least a short section be used.