Combination freeze indicators

A combination temperature exposure indicator suitable for attachment to, or association with, a host product, the combination temperature exposure indicator comprising:

• a substrate;
• a freeze indicator supported by the substrate,
• wherein the freeze indicator comprises:
• (a) an indicator volume;
• (b) an indicator dispersion of solid particles dispersed in a liquid medium, the indicator dispersion being contained in the indicator volume and being capable of coagulating to provide an irreversible appearance change when subject to freezing;
• and
• (c) at least one vapor block member extending around the indicator volume to prevent loss of liquid vapor from the indicator dispersion, and
• a cumulative ambient time-temperature indicator supported by the substrate;
• wherein the freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value.

A combination temperature exposure indicator suitable for attachment to, or association with, a host product, the combination temperature exposure indicator comprising:

• (a) a substrate;
• (b) a freeze indicator supported by the substrate, wherein the freeze indicator comprises a dispersion of solid inorganic pigment particles in an aqueous dispersion medium, the dispersion exhibiting an irreversible appearance change in response to freezing of the dispersion, an indicator volume containing the inorganic pigment dispersion and a viewing window for viewing the dispersion, the freeze indicator optionally comprising an attachment device for securing the indicator to a host product to be monitored;
• and
• (c) a cumulative ambient time-temperature indicator supported by the substrate;
• wherein the freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing temperature wherein the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value.

A combination temperature exposure indicator suitable for attachment to, or association with, a host product, the combination temperature exposure indicator comprising:

• (a) a substrate;
• (b) a freeze indicator supported by the substrate, the freeze indicator being capable of providing a visual indication of exposure of the freeze indicator to a freezing temperature;
• (c) a cumulative time-temperature indicator supported by the substrate, the cumulative time-temperature indicator being capable of providing a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value;
• and
• (d) a threshold indicator supported on the substrate to indicate exposure of the combination indicator to a temperature above a threshold;
• wherein the freeze indicator is initially transparent, both the cumulative time-temperature indicator and the threshold indicator are disposed behind the freeze indicator in relation to a viewer, and both the cumulative time-temperature indicator and the threshold indicator are viewable through the freeze indicator.

A combination temperature exposure indicator suitable for attachment to, or association with, a host product, the combination temperature exposure indicator comprising:

• (a) substrate;
• (b) a freeze indicator supported on the substrate;
• and
• (c) a cumulative ambient time-temperature indicator supported on the freeze indicator;
• wherein the freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value;
• and
• wherein the visual indications provided by the freeze indicator and the cumulative time-temperature indicator are provided in respective indicator areas, wherein one of the indicator areas lies within, optionally entirely within, the other indicator area, and wherein the indicator area of the indicator situated more remotely from the substrate has a transparent appearance prior to providing a visual indication of temperature exposure.