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Paper color will affect your design. Remember that if you print a 100% color on porous paper using offset, the ink will sink into the paper fibers, spreading out physically and losing precision. The paper color will affect the ink color even more in this case. Use a copier or scan your design onto transparent film and hold it up to paper samples. This will give you and your client an idea of how the colors in your design will look on different color papers. This isn't a perfect practice, but it may make you aware of fine lines (including type) and other possible design problems before you go to press.