The No Frill No Fill Challenge

[Acorn]

My method in XDP+ but without using the Name Gallery. Don't follow the Does it scale question?
Sneaky though

Thanks Egg.

By 'scale', I meant double the number of objects.
Does you method still work? Double until you think enough is enough.

Your approach is potentially destructive are you zapping the Line widths.
Had each been different, it might be too difficult to recover them all.

Changing the background is a great first step.
At that point, as you say, just hold the Shift key down and select each filled shape.
Cut these, delete the remainder and Paste in Place to recover the filled one.

A further belt-and-braces step I would take is create any old shape off page and eye-drop the page background as its fill.
When finished, eye-drop back this fill into the Page Background and delete the shape.
I could have set the RGB to (255, 254, 255)!

You do get an extra plus as you uncovered my hidden sneak.
Another plus for not using the Page & Layer gallery and a final one shunning the Name Gallery.

The point of the exercise is @Xara has discounted a No Fill as not being a Used colour so you can never collectively locate any shapes with no fill.

Acorn