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How to age paper in photoshop
Start by creating a new document first or ctrl + n.
Specify the size according to the project you're working on, whether it's a small card or a poster.
Set the colors you're going to be using on your document or paper.
Click on the foreground color picker on your tools panel.
A box will appear or your color picker set then the cmyk settings as indicated on the illustration. Next create a new layer and fill it with newly set color.