is artifact a color

[NIKTER]

Does artefact count as a color?

[DatAsh]

This has been answered a million times by a million people. NO.

Let me put it this way: Is LAND a colour? is CREATURE a colour? Nope, they're all card types.

[Kenji]

ArtifA card's color is determined by any of three things:

1. Mana cost,
2. Color indicators, and/or
3. Characteristic-defining abilities.

Most artifacts have no colors in their mana cost, which makes them colorless. Colorless is the lack of color -- it is not a color itself.
Now, a card like Master Transmuter is blue, because it has blue mana in its mana cost, despite being an artifact. Again, as DatAsh pointed out, Artifact is a card type, not a color - what an artifact's color is, depends on the above factors that I mentioned.