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I was making a couple Materials for a Mesh, and now every new material says "Material.001", "Material.002", and so on. I think it's because of these Materials under the Material icon next to the "+ New" button. How do I delete them?

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No Materials appear under the Mesh's Data in the Outliner, so I can't delete them from there. I can select the Materials to create a new, editable Material, but deleting that Material won't delete the ones under the icon.

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    $\begingroup$ The dropdown menu gives a list of available materials in the scene, they are not applied to the object - they are applied to no object as you can see from the "0" in front of almost all of them - that's why they don't show up under the object in the Outliner. The name suffixes "Material.001", "Material.002" etc. indicate that you created them by duplicating a material named "Material". The numbers will be added because they have no unique name. To get rid of them, delete them from the menu under File > Clean Up > Unused Data-Blocks. $\endgroup$ Commented Apr 5, 2022 at 13:15
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    $\begingroup$ Select one with a '0' against it and click the '-' button? You'll have to do this in Object mode. Alternatively you can save your Blend file and exit Blender. That will delete all the materials which aren't allocated to objects. $\endgroup$ Commented Apr 5, 2022 at 13:16
  • $\begingroup$ @JohnEason "Select one with a '0' against it and click the '-' button"? Closing the blend file and reopening makes much more sense ;) Selecting it would just put it on the object and the '-' button removes it again... so you're back where you were before when it had the '0'. And if you have very many of those '0' objects that's a lot of totally unnecessary work... $\endgroup$ Commented Apr 5, 2022 at 13:22
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    $\begingroup$ @GordonBrinkmann Yes. I agree. Anyway I guess he has enough suggestions to choose from now! :^) $\endgroup$ Commented Apr 5, 2022 at 13:50

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If your materials have the "0" prefix they will be deleted as soon as you'll close your file. That said, you can remove them right away:

Go into File > Clean Up > Unused Data-Blocks:

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Also if you switch the Outliner to Orphan Data you can see what are the unused datas, and click on the Purge button:

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