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Ballpoint pen that writes custom LEDs on paper
- birria 3y agoThis is incredible! I wonder how expensive this perovskite thing is, and how much it costs to make the ink. ie, what would be a reasonable guesstimate of the cost of a BIC LED pen?
- giuliomagnifico 3y agoPerovskite is not very expensive but the process to make it “as a gel” I think it’s expensive because is complex.