The only methods I know involved wetting the paper, which I assume would wreck the drawing?
Yeah I think water and tracing paper is a bad combination. Also the drawing might wash off.
I put them in a book with a load of other books on top for a few days and see how they do.
I think you can actually iron that kind of paper. Obviously test on non art first.
The method I had in mind was soaking it and then using brown paper tape to tape it along each edge to a wooden board. It should then shrink slightly once it dries, which can remove the wrinkles.
And probably wreck all the drawing.
@hoefla started
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The only methods I know involved wetting the paper, which I assume would wreck the drawing?