Strange Artifacts on Glass, dependiong on IOR

[cdnmd]

Hello, I;m trying to make a scene with a mirror, There are several ways to achive realistic mirror material, the simple is use glossy. But I want to reproduce the glass thickness and colored reflections on the edges like a real mirror will do.

I have a mesh of the mirror made with simple Glass BSDF

The back face of it has the inverted normals. The back face using a glossy BSDF to imitate the silver coating.

The Reflections look very good, but there is some artifact appearing on the glass, it looks like a dark circles. When I increasing the IOR of this glass it’s make them thinner. They are completely dissapearing when the IOR is 1 or less. But the glass is loosing it’s natural look.

What suppose to be a problem?
BTW I’ve tried to use Principled BSDF instead of Glass BSDF and the problem is the same.

Also the real glass is reflecting some colored light like a diamond on it’s edges, mostly green and pink, how to make it?

[kesonmis]

Check for double geometry. Maybe you have accidentally duplicated the object or some faces. Also check for not visible but renderable objects in outliner.

[TheTuxedo]

Separate the glass and the silver into 2 different objects. Make sure the glass is solid and has consistent normals. Refractions and glass need an entry and an exit for the refraction to calculate properly.

[cdnmd]

Thank you, I’ve separated the objects and it worked good.