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I am new to blender. What I am trying to do is create rust on some 3D objects.

I tried adding rust to a cylinder and it gave me some decent results, but when I used the same procedure to generate rust over an image texture it's giving strange results.

Thanks Ankit

enter image description here

enter image description here

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in the material you show you're using a Bump node, which creates these 3D bumps, but it doesn't create any color. Maybe try to mix the black/red/white ColorRamp with the Image Texture node in a Color > MixRGB, and try Multiply mode for example:

enter image description here

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