I know, you can't tell colour over the web because of scanners and monitors. Well, I'm going to ask any way!
Going through some Australian stamps I have a number of George Vs. This 3p is a perf 14, therefore an SC#30. But I'm wondering about the colour. It's supposed to be ultra, and it looks more grey with a hint of violet. Maybe I have the wrong impression of what ultra is, but I don't think this is it.

Is this the result of sunlight or oxidation, or am I just wrong about ultra?