Living Ink is a new algae-based ink that changes over time. Creators apply a layer of a “fast” ink, which goes on pink before fading. Then they apply the “slow” ink, which goes on blue. Once the drawing is placed into the special Living Ink greenhouse and put in the light, the algae in the ink begins to grow. The image drawn with the fast ink appears in about two days, with the slower ink taking about four days to appears.
The creators of Living Ink developed the ink in an attempt to make a more sustainable product, but discovered the creative possibilities somewhat by accident.
via Laughing Squid
