Anodizing cooper tubing, can it be done?

Is it possible to to color pain houper tube by anodizing?

Not to my knowledge. Anodising relies on the metal creating a STABLE oxide layer on the surface of the metal. Only Magnesium, Aluminium, Titanium and niobium do AFAIR>
+1 Copper doesn't Anodize. Metals like Aluminum and Titanium are able to form a protective oxide layer that helps prevent corrosion. Copper, steel and iron don't have that ability. They just keep oxidizing and corroding away. So if you want to color copper then you have to paint it. Its not as permanent as when you add pigments while Anodizing aluminum but it's the best you can do. Of you can just buy Anodized aluminum tubing.