Let’s take Copic Classic as an example. When you remove the cap, you will notice the Fine Nib side has the darker gray. As for Sketch and Ciao, Super Brush side has the darker gray. This is for easy identification of nib type. After putting back a cap to to either side of marker, the thin line in two different colors (dark grey and body grey) between cap and body will appear. It means you can identify the type of nib even a cap is closed.
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