This is for the Kingdom Note-exclusive inks , produced by Sailor!
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Sailor is well-known for its inks , pens and has also produced inks for fountain pen shops in Japan. Kingdom Note in Tokyo has worked with Sailor to produce a "biological" line ; Insect , Bird and Fungi. Each of these inks are specially formulated to mimic the colour of each creature as closely as possible.
This ink is meant to replicate the husk of the stag beetle, which would make it a black ink. What makes this ink interesting is its green sheen after it has dried, typically not seen in black inks! Here are some pics to demonstrate its beautiful colour.