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Scientific American

2022-08-05, 01:41
Marker Tip--Without Ink!--Makes a Hardy Medical Sampler

The marker material conserved samples for up to a week



https://www.scientificamerican.com/artic...l-sampler/
www.chinaphonearena.com > Off The Wall > Tech & Science > [Sci-Am] Marker Tip--Without Ink!--Makes a Hardy Medical Sampler