What is the difference between TPX and TCX? Mainly in the P and C, P is the paper, C is the cotton, that is, TPX is printed on paper color, and TCX is the color effect on the cotton. Click the “Pantone Color Guide” link in the “myPANTONE X-Ref” box.Select “color cross-reference” from the drop-down menu and click it.Roll your mouse cursor over the help center link in the navigation bar at the top of the page.7 What does TPX stand for in Pantone colors?.