Why don't your trout fishing flies sink fishing flies that have a density greater than water they do not float in other fluids with the same density as water?

Well, im the guy to answer this, a fly fisherman. You probably have dry flys This means the fly you bought, was pre-tipped with a powder that makes the fly float I'm guessing, the powder reacts with the "other fluids" creating a no longer floating fly.

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