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color shifting ink /ˈkʌlə ˈʃɪftɪŋ ˈɪŋk/ n

中文：防伪油墨

中文 · 防伪油墨Español · tinta de color cambianteFrançais · encre à couleur changeante
Meaning：A feature to prevent counterfeiting; a special ink is used that changes color when viewed from various angles.
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