Figure 5: Reversibility and repeatability of hydrochromic RP.
From: Hydrochromic molecular switches for water-jet rewritable paper
(a) The reflective UV-vis spectra of the RP integrated with 1 before (black trace) and after (blue trace) addition of water, at which points the material turns from a white to a dark blue, respectively. The size of the photographs for rewritable papers is 40 mm by 40 mm. (b) A plot of the reflectivity at 592 nm versus the number of cycles as the RP material is cycled through water spraying (write) and water removal (erase) by means of heating at 70 °C.
