I am studying an inviscid fluid. I am trying to characterise the fluid. Does it make sense to call it Newtonian or should I avoid this designation? What I mean is - if there are no viscous stresses then does it make sense to characterise it's response to viscous stresses? (That box that doesn't exist - what colour is it?!!) Also if the fluid is incompressible does this imply the fluid is homogeneous, i.e. is it better to use one or other of these terms but not both?