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0.7 Produced in 2006
1.0 Produced in 2018
1.5 Produced in2013-14
2.0 2Produced in 2014
Bright redish purple brown Not suitable for using as deep ink.
It is suitable for writing calligraphy and for paper called gasenshi.
It is a black ink with red iron oxide, and there is a variety of colors in the black that is different with conventional ink sticks.
As it gets older, the color becomes more distinctive, and it can even be used as very light color by adding more water.