Tanshin (True Heart).
Ebonite in black and red, made by hand.
The image of color: In any age, feelings like thinking of an important person, burn quietly, but strongly in one’s heart.
Ebonite is a type of resin that has a very long history. It is considered the first “synthetic resin”to become widely used from 19th century. Ebonite, made from ruber and sulfur, is very firm and strong to acid, and changeless, so that is good material for fountain pens.