Multicolored marbled patterns!

Ladies and Gentlemen, I give you an unsuccessful attempt to clean tape scum off a delicate semiconductor surface.  The carbon tape I use in the scanning electron microscope, which looks so cool in the microscope and improves my image quality so much, leaves scum behind, as it turns out.  The crud is hard to remove - I treated it with various solvents, and finally the only thing that touched it was tens of minutes under a glowing microwave plasma.

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