首页>
外国专利>
process for the preparation of a mixture of temperature by the perception of a colour change.
process for the preparation of a mixture of temperature by the perception of a colour change.
展开▼
机译:通过感知颜色变化来制备温度混合物的方法。
展开▼
页面导航
摘要
著录项
相似文献
摘要
PH indicator composition has controlled change of color at a selected sub-freezing temperature. The composition comprises at least one pH indicator, a buffer solution containing at least one inorganic ion in solution and a control agent or a precursor of a control agent. The buffer solution has a pH capable of changing when the temperature of the buffer solution is lowered to below freezing. The control agent is capable of effecting a change in ionic strength and proton composition of the frozen pH indicator composition to thereby control the temperature at which the color change occurs. A method of using the composition comprises lowering the temperature from a first temperature above freezing to a second temperature at which the pH indicator composition is in a substantially frozen state. The composition is particularly useful in a color change thermometer.
展开▼