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Methods"],"abstract":"<jats:p>\n                    This work introduces a highly sensitive colorimetric system for detecting Cu\n                    <jats:sup>2+<\/jats:sup>\n                    ions, employing\n                    <jats:italic>Caesalpinia sappan<\/jats:italic>\n                    L. extract both as a standalone indicator solution and as an integrated functional element within electrospun membranes.\n                  <\/jats:p>","DOI":"10.1039\/d6ay01681b","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T06:23:31Z","timestamp":1789626211000},"update-policy":"https:\/\/doi.org\/10.1039\/rsc_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Colorimetric analysis of Cu\n                    <sup>2+<\/sup>\n                    ions using a halochromic indicator solution and an electrospun film prepared using\n                    <i>Caesalpinia sappan<\/i>\n                    L."],"prefix":"10.1039","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6690-4646","authenticated-orcid":false,"given":"Simran","family":"Nagpal","sequence":"first","affiliation":[{"name":"Department of Chemistry, Christ University, Hosur Road, Bengaluru 560029, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5815-5230","authenticated-orcid":false,"given":"Vinod","family":"T. 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