Now there is a way to use ink to write words or patterns in liquid, much as you might write on a solid surface, and the letters could conceivably last a very long time
Writing on solid materials, like parchment or paper, is possible because the ink binds to the surface and remains undisturbed. But in a liquid, particles are constantly moving around, and ink quickly disperses – until now.at Johannes Gutenberg University Mainz in Germany and his colleagues have used a resin bead
to draw lines and patterns in water containing ink particles. It works because the bead produces paths of low acidity through the water that attract the ink.
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