Cyan Stained Clay is grey

[^sF7CPNR[1].png]

This is intended. Because hardened clay has a reddish tinge, cyan becomes more of a gray color.

But the gray stained clay is brown?

Dark brown + gray = light brown

http://minecraft.gamepedia.com/Stained_Clay

It is available in the same 16 colors that wool can be dyed, although the shading of the color is less vibrant.