A fluid-flow contaminant indicator includes a container having a fluid-flow path having an upstream region and a downstream region. A colorimetric indicator, disposed in the fluid-flow path, has a surface adapted to change color when exposed to a contaminant of interest. The colorimetric indicator has at least one hole passing there through such that the fluid-flow path extends through the hole(s) in the colorimetric indicator. A fluid-impervious mask is adhered to all of the colorimetric indicator's surface except for a region of the surface that is adjacent to the hole(s) in the colorimetric indicator wherein this region is exposed to the upstream region of the fluid-flow path.

The present invention addresses the problem of providing a temperature detection label capable of preventing falsification using a simple structure. To solve this problem, the present invention provides a temperature detection label that is characterized by comprising a supporting member and a temperature detection part provided on the supporting member and in that: the temperature detection part has a temperature detection material that, in a heating process, starts color development at temperature T.sub.1 and starts losing color as a result of melting at temperature T.sub.2 and, in a cooling process, solidifies while remaining colorless by being cooled to temperature T.sub.1 or lower; the temperature detection material includes a leuco dye, decolorizer, and developer; and the temperature detection label also comprises a member having an appearance that changes between T.sub.1 and T.sub.2, inclusive, or a high-melting-point material having a melting point or glass transition temperature higher than T.sub.2.

A packaging material for use in a package having contents including a food item, the packaging material includes a layer including an additive transformable from a first state to a second state in response to an external stimulus and a barrier layer positionable between said layer and the contents of the package. The barrier layer restricts diffusion of said additive to the contents.

Disclosed herein is a system for indicating via a colorimetric reaction the presence of a substance in a sample, comprising: a bottle containing a reagent and closable by a removable lid; and a label coupled to the bottle and comprising visual indicators for indicating the presence of a substance in a sample, wherein upon mixing the sample with the reagent in the bottle, the mixture changes to a particular color based on the identity of the substance in the sample, and each visual indicator is colored the color the mixture would be if a respective substance is in the sample, such that correspondence between the color of the mixture and the color of a visual indicator indicates the presence of the substance indicated by that visual indicator.

A visually sensible indicator of temperature including electronic temperature sensing circuitry sensing at least when a temperature exceeds at least one predetermined temperature threshold and providing at least one corresponding threshold exceedance output which is sensible as heat and a heat-responsive visually sensible display which is responsive to the at least one threshold exceedance output for providing at least one visually sensible indication indicating that the temperature has exceeded the predetermined temperature threshold.

The present invention relates to a device for monitoring a temperature variation undergone by a product, which detects a drop in temperature below a predetermined temperature threshold (T.sub.cs), comprising: a sealed casing (I) which defines a containment space (V), and a mixture contained, or containable, in said containment compartment (V) which comprises a liquid phase (S) and a solid (D) comprising metal particles having an average nanometric size comprised between 1 and 300 nm and a coating layer (R) of said particles. This coating (R) comprises an organic material and is configured in such a way that, in a configuration of use of the device at a first temperature (T.sub.1) greater than said threshold temperature (T.sub.cs), it allows the maintenance of the solid (D) in solution in said liquid phase (S), in which the particles are separated from each other, while at a crystallization temperature (T.sub.2) of said liquid phase (S), being said temperature (T.sub.2) equal to or lower than said threshold temperature (T.sub.cs), the coating layer (R) separates from the metal particles allowing an aggregation of the metal particles. The mixture undergoes an irreversible loss of optical properties, allowing the detection of undesired temperature variation.

A dual-function heat indicator for monitoring two or more modes of heat exposure is described. A manufacturing process for the dual-function heat indicator is also described. Dual-function heat indicators as described may be useful for monitoring the exposure of host products, with which the dual-function heat indicators may be associated, to cumulative ambient heat exposure and to a peak ambient heat exposure, and for other purposes.

A time-temperature integrating (TTi) indicator label comprises an initiator reservoir and a target reservoir, said initiator reservoir containing a pH modification system and said target reservoir comprising a pH responsive indicator. The pH responsive indicator may be photo-initiated. There is also provided a time-temperature indicator label comprising first and second reservoirs separated by a hydrogel valve, said valve allowing passage of an acid from said first reservoir to said second reservoir when the hydrogel valve is activated.

Please substitute the new Abstract submitted herewith for the original Abstract: A temperature detecting material comprises a first material containing a first temperature indicating material and a second material containing a second temperature indicating material, wherein the first temperature indicating material and the second temperature indicating material contain a leuco dye, a color developing agent, and a decoloring agent, and have a hysteresis characteristic in their color density-temperature curves, wherein the first temperature indicating material has a color developing temperature in a temperature increase process lower than a decoloring temperature in the temperature increase process, and turns to a non-crystalline state and is kept in a decoloring state when cooled down below the color developing temperature in the temperature increase process with a predetermined cooling speed or more after melting, wherein the second temperature indicating material, a color developing temperature is lower than a decoloring temperature in the temperature increase process, and wherein the color developing temperature in the temperature increase process is lower than the decoloring temperature in the temperature increase process and the color developing temperature is lower than the color developing temperature in the temperature increase process.

A dual-function heat indicator for monitoring two or more modes of heat exposure is described. A manufacturing process for the dual-function heat indicator is also described. Dual-function heat indicators as described may be useful for monitoring the exposure of host products, with which the dual-function heat indicators may be associated, to cumulative ambient heat exposure and to a peak ambient heat exposure, and for other purposes.