公开(公告)号：US10094609B2

公开(公告)日：2018-10-09

申请号：US15124585

申请日：2015-02-26

Applicant: Toppan Farms Co., Ltd.

Inventor： Nobutaka Ueda ,  Yasuhiro Tanaka

IPC: C09K5/06 ,  F25D3/00 ,  C09K5/08 ,  G01N21/80 ,  G01N31/22

Abstract: A refrigerant pack is provided with a refrigerant substance containing water, a precipitating component, a non-precipitating component, and a pH indicator, and is configured such that the precipitating component precipitates when the refrigerant substance freezes and is a component not corresponding to the pH indicator, the non-precipitating component does not precipitate when the refrigerant substance freezes and is a component not corresponding to the pH indicator, a change or the presence/absence of coloring in the pH indicator is reflected before and after freezing, and the refrigerant substance changes in color.