Supplement
Indicator Ink Checkable for Security Printing and Packaging Application
2018 年 42 巻 3+ 号 p. 44-
詳細
2018 年 42 巻 3+ 号 p. 44-
The checkable indicator ink (Cii) was developed on the basis of semiconductor (SC) photocatalyst reaction and the redox dye (D) which could be printed as security ink and checked by exposing to UVA-light for counterfeit products. The Cii comprised of SC (titanium dioxide, TiO2), D (anthraquinone-2-sulfonate, AQS) and electron donor (glycerol), was dispersed in a polymer medium. Upon UVA exposure, the Cii label abruptly changed from colorless to yellow. At this state, the yellow-green luminescence of this Cii label was distinctly revealed when it was witnessed under dark condition. However, the Cii could be recovered to its original color when it was placed under room atmosphere for ~1.5-6.5 hrs.
