Only show ColorRect when out of light?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By PugMasterPug

I want to have a ColorRect in which the parts that are reached by light aren’t shown.
In the CanvasItemMaterial there is the Light Mode “Light Only” to only show parts that are reached by light, so could this be used in reverse? I have no idea how I could to this.

Thanks in advance.