What type of fishing line for setting downbearing?

[Farrell]

I just use heavy-duty tread. Sometimes it helps a bit to angle some light, 
but I've never really had any trouble telling when it touched the bridge. 
FWIW.

Terry Farrell

----- Original Message ----- 
> Does anyone have the correct name for the type of fishing line best used 
> for checking/setting downbearing?
> I saw it in a class, but can't remember the type of line that was used.
> It was clear/opaque, and when it touched the bridge, you could immediately 
> see the contact 'through' the line.
>
> Best regards,
> Brad Smith, RPT