I just remember Mel when he was teaching the hauls would cut a 8 wt DT line in half splice it to some running line on put it on a 5 or 6 wt rod This heavy level line could sure be felt with the 5 wt rods.
I have used 5/6 St. Croix Imperial rods in 8-9 ft for years as teaching tools. I load them with SA's bright chartous line. WF6F
This the student can see. For years I have used the orange lines but the new SA is even easier to see.

ol AL