Process for monitoring the history of temperature versus time of deep-frozen product,indicator for applying said process and utilization of said process

摘要: The disclosure concerns an indicator for providing a time/temperature integrated indication of the temperature history deep-frozen product through diffusion water along cellulose wick. wick is provided on itself with soluble, hydrate forming substance, such as sodium chloride and citric acid. covered in plastic covering opening exposing to at product, advance front indicated by adjacent and/or acid/base spaced from indicator.