Ryumonji Yaki is sometimes referred to as Black Satsuma, but that is not entirely true. Certainly much of Ryumonji is black, usually with a splash of color glaze somewhere, but there is much more to it than that. Other styles include "sansai" or three-colored, sharkskin, white shark skin, as well as brown, blue and ochre glazed ware.
see:
http://ryumonjiyaki.jp/gallery/index.htm
Here is an example of black Satsuma with a blue/green flow glaze
