Assigning swatches to drawings for easy adjust onion skin.
To adjust transparency individually for each drawing can make it more predictable which drawings you see while turning on onion skin. This method also works in the send drawings to drawing view. Together they give you a better
control over the drawing process in the difficult stage of developing the movement with ruff drawings and starting the clean up and inbetweening. It might seem much to assign so many swatches but the logical numbering of swatches and drawings make it quite easy to keep track of the drawings and the corresponding swatches.

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