There is a total of 358 colors of Copic Ink refills in the Copic Series, and out of those, No. 0 (Colorless Blender) can be used as a thinner. You can also purchase empty bottles that are sold separately and use them to thin existing colors or mix them to make your own unique custom colors.
Copic Ink, 12ml, 380 yen for each color (excluding tax)
Economy-size bottles that hold 200ml of the Colorless Blender are also sold for 1,500 yen (excluding tax).
*Few stores carry these, so make sure to ask in advance about availability. If these are difficult to find locally, they can be purchased online.
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