Topic: Supplies
To mark the critical lines on my rulers for the current project I have mainly used blue painters tape, which blocks out the view below it or I have marked on the non-print side of the ruler with Sharpie marker, which is hard to see when used on darker fabrics (it can later be removed with rubbing alcohol)
At the Sewing Expo I saw demonstrators using GlowLine tape to mark their rulers. Makes it a snap to line up the right rule line over and over without error - and you can see right through it.
As you can see the package comes with pink, orange and yellow tapes so you can easily find one to use against any fabric.
Ddd