| 摘要 |
The invention concerns an ink composition comprising an oxidizing and reducing agent and/or pH colorant as the dye, polymeric material as the binder, as well as a pH adjuster and volatile solvent. Further, the invention concerns a method for manufacturing an oxygen and/or pH indicator, in which the ink composition is printed and reduced, or reduced using a volatile reducer and printed; an oxygen and/or pH indicator manufactured by the method, as well as a package for stating a leakage, a change caused by oxygen content and/or deterioration of a product.
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