Why does color appear different on default material?

I can paint the segments of the screw to a new color. But, I’d like to understand why they look different–I think they are both “default”:

screw-4x40x.75 pan head.skp (614.7 KB)


The darker faces are back faces. Those are inside out.

Here I’ve changed the back face color.

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Is there an easy way to flip inside out?

Select the incorrectly oriented faces, right click on them, choose Reverse Faces.

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Is this supposed to be a usable screw?

There are alignment issues with the sections of the threads.

Thanks for pointing that out.