Yasutomo vermilion ink is a rich, warm, red-orange color.

It is traditionally used in hand-lettered manuscripts, seals, and ink paintings. It is also commonly used in Asia by calligraphy instructors to correct students’ work.
 
This water-resistant ink is opaque and dries to a permanent matte finish.
Use directly from the bottle for dip pen calligraphy and brush painting. Mix with black ink to create a rich brown or warm black calligraphy ink.