| 摘要 |
PURPOSE:To obtain a time indicator which facilitates confirmation of a preservation period or available period and elapsed time at a look from afar, by incorporating both a redox indicator and an air-oxidizable material in a liquid. CONSTITUTION:Both a redox indicator and an air-oxidizable material are incorporated in a liquid. The resulting time indicator is put in a container such as a tube and sealed. At the time of use, part of the container is broken to expose the liquid to air. The liquid keeping a redox reaction may be any of water and an org. solvent, and water or org. solvents for the redox indicator or the easily air-oxidizable material can be used as such. Examples of the redox indicators are resazurin, indigo sulfonic acid, etc. It is preferred to add small quantities of sodium azide, phenylmercury, etc. as germicide and mildewproofing agent for the time indicator itself.
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