Removing a material color change

Hi all,

Working with LumenRT 5: I have  attached the LumenRT material LRTGRASS1 to a surface. All surfaces on the same level have automaticaaly get the same material. I tried to change the color of the grass,

Now I don't want to have the color change anymore, but the Remove option is not available. How to remove the color change?  (In the meanwhile I have saved the file < I can not undo anymore)

Best regards

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