Ancho chile powder is made up purely of dried and ground ancho chiles (as opposed to standard "chili powder," which is actually a mix of ground chiles with several spices like oregano, garlic powder, and cumin. It has a moderate heat level with fruity undertones. Delicious used in spices rubs and mole sauce.
Substitute another pure chile powder, such as pasilla.
Store in a cool, dry place.