Increasing the power to 17.5% (5.4 mW), produced channels in Material 3 via ablation. Both of these laser settings (and therefore both swelling and ablative modifications) were used to generate a message in Braille on Material 3 (Fig. ). The lower power setting (638 nm, 2.4 mW) was used to generate the raised dots spelling "secret message" in Braille. To generate each raised dot, the laser was exposed to the polymer surface for 1.3 seconds. As shown by stylus profilometry, the dots are uniform in size with a height of 3.6 µm ± 0.2 µm. The higher laser power settings (638 nm, 5.4 mW) were used to install pits via ablation at each corner of the image. A laser exposure time of 1.3 seconds was also used for these modifications. These pits served as fiducial markers for relocating the site of the message after the erasing process. It was hypothesized that because the ablation expels sulfur from the polysulfide (Fig. ), these regions would no longer be able to be reshaped or erased because of the absence of the requisite S-S bonds. In contrast, the areas that were swollen did not lose sulfur so they were predicted to still have dynamic S-S bonds that can be reshaped and erased by heating. Testing this hypothesis, the material with the Braille message was incubated in an oven at 160 ºC for 5 hours. Optical microscopy and stylus profilometry imaging confirmed that the raised dots were erased by this thermal treatment, while the pits formed by ablation remained intact (Fig. ). This series of experiments demonstrated that multiple types of modifications could be installed on Material 3 simply by altering the laser power. Furthermore, the areas of polymer swelling could be erased by incubating in an oven. This erasable information encoding process constitutes a new direction in photoresponsive materials, with benefits in simplicity of the material synthesis and use of low-power lasers.