The key to identifying a Germantown blanket is recognizing the yarn. Germantown yarn is plied, meaning there are multiple strands of yarn twisted together. Early Germantown yarn (circa 1868) was three-ply. By the early 1870s, four-ply yarn became the standard, producing a fine, even weave./
Bright colors are also characteristic of Germantown blankets - although as aniline dyes became more accessible, weavers would also dye their homespun yarn with these vivid hues, so color alone is not an indicator.