Ink label kanji?


So I was looking at a modular kit that was made in Japan, and inside of the
box were some ink labels (I think CMYK). Here is a picture: [![Ink
labels](https://i.stack.imgur.com/ZwJaU.jpg)](https://i.stack.imgur.com/ZwJaU.jpg)

I recognized three of the four kanji. The first being 墨 (black ink), third as
赤 (red), and the fourth as 黄 (yellow), but I cannot seem to recognize the
second label. I have looked by radical and in the WWWJDIC dictonary by Jim
Breen and could not find it. Could someone tell me what this is? I used the
search terms "blue", "azure", and "cyan".




It's 藍 -- the character for indigo.




It's 藍 -- the character for indigo.

