Starfish update! Today I bombarded a tangerine-colored tube full of neon gas + mercury. It has the same effect as argon gas + mercury. Without the mercury, the tube would be bright red-orange, but with it, it became peach. With the tube in the wood frame, the starfish glows! (It's a different color in the lower left corner because of the different shades on the electrodes on the ends.) Yay for neon!
This is amazing. Twitter'd about it this AM.
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