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When I add an image with a transparency layer on the bottle, it darkens the entire bottle and I have no idea what's going on. I followed this guide to the word but can't seem to figure out what I'm missing.

This is what it looks like with the text image. enter image description here

This is what it looks like without the text image. enter image description here

Here's a screenshot so y'all can see real quick what the setup's like. enter image description here

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There's still residual color information in the alpha area of your png. The better way to fix this is to get rid of the color mix node. Create a seperate shader for your screen-print ink material and wire that and your glass shader node into the mix shader node. Now drive the shader mix with your alpha channel.

Node Setup

This also allows you to modify the material properties of the ink without the need for a much more complex setup.

You could also achieve a result with minimal effort using the following node setup:

But this might not be physically correct, depending on the exact production method for the label, of course.

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