PROBLEM TO BE SOLVED: To provide a cold insulation tool capable of easily performing a visual acknowledgement about whether or not a cooled state is kept at an object state.SOLUTION: A cold insulation tool comprises a composition for cold insulation which has water and surface-active agent and color of which varies before and after its freezing. The surface-active agent has molecular weight of 110 or more, an HLB value is 6 to 17 and the composition of cold insulation has a difference where L* before freezing is subtracted from L* after freezing becomes 11 or more in reference to L* of L*a*b* color specification system measured from outside the cold insulation tool.COPYRIGHT: (C)2016,JPO&INPIT【課題】冷却状態が目的とする状態にあるか容易に視認可能な保冷具の提供。【解決手段】水及び界面活性剤を含有し、凍結の前後において色彩が変化する保冷用組成物を供えた保冷具であって、前記界面活性剤は、分子量が110以上で、且つHLB値が6~17のものであり、前記保冷用組成物は、前記保冷具の外側から測定したL*a*b*表色系のL*について、凍結後のL*から凍結前のL*を引いた差が11以上となるものである保冷具。【選択図】なし
