>>11483170 (LB)
https://www.seas.harvard.edu/news/2013/07/watermark-ink-device-wins-rd-100-award
W-Ink: Multilevel Encryption of Wettability
The researchers used "secret messages" to demonstrate how each chip can be customized to recognize particular substances and respond differently to each one. In the presence of water, these chips display a decoy message: "Ω Δ Π / 507." Only when swabbed with 77% ethanol (top chip) and 100% ethanol (bottom chip) will the true message be displayed: "MAT SCI"—short for "materials science."
Is corn (harvest) used for ethanol production?