Hello! I'm trying to get some parts to have a smooth, black anodized aluminum appearance. I've tried quite a few of the appearances in the library but they are either shiny or speckled.

Satin finish aluminum and matte aluminum look like this, with a speckled texture:

Polished aluminum is smooth, but even if I reduce the specularity I can't get the highlight to look more like anodized aluminum. (Rather, the "specular amount" is having zero effect on the rendering.)

The appearance contributed here: ​ also has a bit of texture to it:

Is this how those appearances are supposed to look?
Does anyone have any suggestions for getting a nice satin finish? Thanks!