초록 ▼

A color change indicator including: a liquid having a predetermined index of refraction and rate of evaporation; a reservoir for holding the liquid; and an opacifying layer of microporous material. The opacifying layer has an index of refraction approximately the same as that of the liquid and overl

A color change indicator including: a liquid having a predetermined index of refraction and rate of evaporation; a reservoir for holding the liquid; and an opacifying layer of microporous material. The opacifying layer has an index of refraction approximately the same as that of the liquid and overlies the reservoir. The opacifying layer has an open-cell network of pores for absorbing the liquid from the reservoir and is in a first radiation scattering condition when the liquid occupies the opacifying layer and in a second scattering condition when the liquid is depleted from the opacifying layer.

대표청구항 ▼

A color-change indicator comprising: a liquid having a predetermined index of refraction and rate of evaporation; a reservoir for holding said liquid; and an opacifying layer of microporous material having an index of refraction approximately the same as that of the liquid, said opacifying layer ove

A color-change indicator comprising: a liquid having a predetermined index of refraction and rate of evaporation; a reservoir for holding said liquid; and an opacifying layer of microporous material having an index of refraction approximately the same as that of the liquid, said opacifying layer overlying the reservoir and having an open-cell network of pores for absorbing the liquid from the reservoir, and said opacifying layer being in a first scattering condition for incident radiation when said liquid occupies said opacifying layer and in a second scattering condition when said liquid is depleted from said opacifying layer.