From monochrome to bichrome. Compare these sherds from Ekron to the photograph of sherds from Ashdod, to see an evolution of Philistine pottery styles. The Ekron assemblage is in an earlier style, known as monochrome, in which the decoration is in a single color (typically black or red). Spirals and horizontal bands provide the primary decorative motifs. Monochrome pottery dates to between 1175 and 1150 B.C.