Metallurgeon
Artifact Creature — Human Artificer
, 
: Regenerate target artifact.
"By the time I got there, the heart had stopped. Fortunately, I was able to replace it with something better."
Warren Mahy
Shards of Alara (ALA)
• #19Rulings
The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.
(wotc • 2008-10-01)
Rulings
The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.
(wotc • 2008-10-01)