[header] How to age paper in photoshop [title] Start by creating a new document first or ctrl + n. [step] Specify the size according to the project you're working on, whether it's a small card or a poster. [title] Set the colors you're going to be using on your document or paper. [step] 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. [title] Next create a new layer and fill it with newly set color.