A single-page installment of E. Bittner's series on the construction of weaves, covering color effects. It explains how to work out in advance the look of a weave with colored warp and filling threads, including finding the pattern size as the least common multiple of the weave and color repeats, and drafting on cross-section paper. Figures 517 to 526 show color effects on plain weave, such as cross stripes, warp stripes and block effects, each with a caption giving the color order.