Hackaday2 个月
scratch and sniff
Microscopic amounts of aromatic materiale are trapped inside gelatin or plastic capsules, and then stuck to paper. When you scratch the surface, these capsules rupture, releasing their aromatic ...
Hackaday2 个月
Scratch And Sniff Stickers And The Gas Panic Of ’87
Microscopic amounts of aromatic materiale are trapped inside gelatin or plastic capsules, and then stuck to paper. When you scratch the surface, these capsules rupture, releasing their aromatic ...