hitchhiker: image of "don't panic" towel with a rocketship and a 42 (Default)
hitchhiker ([personal profile] hitchhiker) wrote2019-01-11 02:31 pm
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hitchhiker: image of "don't panic" towel with a rocketship and a 42 (Default)

[personal profile] hitchhiker 2019-01-14 07:35 am (UTC)(link)
yes :) it's a photoswitchable dye that changes colour when the light of the right frequency is shone on it.
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