A single-page installment of Posselt's "Color Effects" series from Posselt's Textile Journal, February 1919, giving rules and 38 numbered illustrations of how color arrangements in warp and filling combine with weave to produce color effects. Examples cover plain weave in 2 and 3 colors, four-harness even-sided twill, four-harness basket, broken twill, a twill stripe, and a fancy weave. The rule given is that warp color shows where there are risers and filling color where there are sinkers.