Dirty.looking haze on imported surface

Hello, I imported a model using the SimLab OBJ Importer. When I apply textures to the surfaces, a dark, dirty-looking haze appears on the surface. I can’t get rid of it. Can someone help me?

Best guess without being able to inspect your model is you have smoothed or softened edges.

Thank you, that was exactly the right solution. I would never have thought of that!