Traditional Sumi ink is made mainly from soot of burnt lamp oil or pinewood, animal glue and perfume.
Sumi ink is roughly categorized into two types:
Yuenboku (sumi made of lamp soot) and Shoenboku (sumi made of burnt pine)
Sumi ink that has reddish color is called Chaboku, and the one that has bluish color is called Seiboku. In general, Chaboku is often a type of Yuenboku and Seiboku is a type of Shoenboku, but there are exceptions as well.