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The use of metal cation\u2010ionic liquid complexes is increasing due to the easiness to tailor their properties, leading to changes in thermochromic response. This work presents the synthesis and introduction of thermochromic 1\u2010butyl\u20103\u2010methylimidazolium chloride and 4\u2010chloronickelate ([BMIm]<jats:sub>2<\/jats:sub>[NiCl<jats:sub>4<\/jats:sub>]) complexes into water\u2010based inks. Formulations with varying concentrations of complexes (10\u201340\u00a0wt.%) are printed on tags thorugh a roll\u2010to\u2010roll process and tested between 30\u201345\u00a0\u00b0C. Also, films with one to five layers are analyzed for color contrast and different encapsulating materials are studied to improve the thermochromic films' robustness. The optimal films, with three layers of ink with 40\u00a0wt.% complexes encapsulated with Fixomull Transparent present enhanced color contrast and fast response time. Red\u2010green\u2010blue analysis is performed on these films, revealing a blue\/red ratio of 1.7 after heating at 40 \u00b0C for 30 min. This work paves the way for developing flexible stickers with fast response and high contrast. The innovative and straightforward thermochromic inks' production process and compatibility with large\u2010scale manufacturing show their promising future as cost\u2010effective stickers for smart packaging applications, such as visual indicators of ideal food consumption temperatures.<\/jats:p>","DOI":"10.1002\/admi.202400972","type":"journal-article","created":{"date-parts":[[2025,4,5]],"date-time":"2025-04-05T05:36:50Z","timestamp":1743831410000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Flexographic Printed Flexible Thermochromic Stickers for Smart Sensing Applications"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3527-7857","authenticated-orcid":false,"given":"M.","family":"Morais","sequence":"first","affiliation":[{"name":"CENIMAT i3N Department of Materials Science School of Science and Technology NOVA University Lisbon and CEMOP\/UNINOVA  Caparica 2829 \u2010 516 Portugal"}]},{"given":"J.","family":"Figueira","sequence":"additional","affiliation":[{"name":"CENIMAT i3N Department of Materials Science School of Science and Technology NOVA University Lisbon and CEMOP\/UNINOVA  Caparica 2829 \u2010 516 Portugal"}]},{"given":"M. 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