Another fine line marker which I have been pleased with the results ...
... white ceramic lead pencils (refillable mechanical pencil) from Fons and Porter.
They leave a nice fine line which holds well til I am done quilting.
Very often, it disappears pretty much on its own with the quilting.
If it needs to be removed, there's an eraser on the tip of the pen.
A gentle rub and it's gone.