[vtkusers] SetColor values

[Vetria Byrd]

In viewing several of the .py examples there are lines of code like

isoActor.GetProperty().SetColor(antique_white[0],antique_white[1],antique_white[
2]);

where are the color values defined?  
for instance: antique_white[0], antique_white[1], antique_white[0];

Thanks,
Vetria