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These systems can be engineered to provide lasting color, but there are a limited number of materials that can undergo transient changes in their visual appearance in response to external stimuli without requirements for advanced fabrication strategies. The authors describe color\u2010changing paint formulations that leverage the redox\u2010dependent absorption profile of xanthommatin, a small\u2010molecule colorant found throughout biology, and the electronic properties of titanium dioxide, a ubiquitous whitening agent in commercial coatings. This combination yields reversible photoreduction upon exposure to sunlight, shifting from the oxidized (yellow) form of xanthommatin, to the reduced (red) state. The extent of photoreduction is dependent on the loading density and size of titanium dioxide particles, generating changes in hue angle as large as 77% upon irradiation. These coatings can be blended with non\u2010responsive supplemental colorants to expand the accessible color palette, and irradiated through masks to create transient, disappearing artwork. These formulations demonstrate energy\u2010efficient photochromism using a simple combination of a redox\u2010active dye and metal oxide semiconductor, highlighting the utility of these materials for the development of optically dynamic light\u2010harvesting materials.<\/jats:p>","DOI":"10.1002\/advs.202302652","type":"journal-article","created":{"date-parts":[[2023,10,4]],"date-time":"2023-10-04T04:29:31Z","timestamp":1696393771000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Color\u2010Changing Paints Enabled by Photoresponsive Combinations of Bio\u2010Inspired Colorants and Semiconductors"],"prefix":"10.1002","volume":"10","author":[{"given":"Cassandra L.","family":"Martin","sequence":"first","affiliation":[{"name":"Kostas Research Institute at Northeastern University  Burlington MA 01803 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaitlyn R.","family":"Flynn","sequence":"additional","affiliation":[{"name":"Kostas Research Institute at Northeastern University  Burlington MA 01803 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taehwan","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Northeastern University  Boston MA 02115 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Skyler K.","family":"Nikolic","sequence":"additional","affiliation":[{"name":"Kostas Research Institute at Northeastern University  Burlington MA 01803 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3226-2470","authenticated-orcid":false,"given":"Leila F.","family":"Deravi","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology Northeastern University  Boston MA 02115 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1472-9623","authenticated-orcid":false,"given":"Daniel J.","family":"Wilson","sequence":"additional","affiliation":[{"name":"Kostas Research Institute at Northeastern University  Burlington MA 01803 USA"},{"name":"Department of Chemical Engineering Northeastern University  Boston MA 02115 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,10,3]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1211535"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.crpv.2014.05.003"},{"key":"e_1_2_8_3_1","volume":"42","author":"Opris V.","year":"2022","journal-title":"J. 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