Abstract: A self-supporting film (10) comprises a gas barrier layer (20); a semi-permeable layer (40); and an indicator material (30), preferably a colorimetric indicator material, is provided between the gas barrier layer (20) and the semi-permeable layer (40). The indicator material (30) is in direct contact with the gas barrier layer (20). The film (10) is particularly useful as an item of packaging, particularly in packaging for perishable materials.

Abstract: There is described an indicator device comprising: an indicator section comprising an indicator material that displays different visible properties in response to the presence or absence of an activating agent; an activator section comprising an activating agent that effects a change in the visible properties of the indicator material; and a barrier section comprising a barrier layer that is substantially impermeable to the activating agent, the barrier section being located between the indicator section and the activator section; wherein at least part of the barrier layer is configurable to allow the activating agent and the indicator material to come into contact with each other, thereby effecting a visible change. The device may be used to detect or report the passage of time and can be applied to perishable goods and/or associated packaging to show that packaging has been compromised and/or that the device has been compromised.

Abstract: There is described an indicator device comprising: an indicator section comprising an indicator material that displays different visible properties in response to the presence or absence of an activating agent; an activator section comprising an activating agent that effects a change in the visible properties of the indicator material; and a barrier section comprising a barrier layer that is substantially impermeable to the activating agent, the barrier section being located between the indicator section and the activator section; wherein at least part of the barrier layer is configurable to allow the activating agent and the indicator material to come into contact with each other, thereby effecting a visible change. The device may be used to detect or report the passage of time and can be applied to perishable goods and/or associated packaging to show that packaging has been compromised and/or that the device has been compromised.

Abstract: There is described an indicator device for detecting a change in atmospheric conditions, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being incorporated into one or more layers; wherein the indicator material displays different visible properties in different atmospheric conditions, and wherein the barrier section provides a semi-permeable seal configured to allow controlled flow to the indicator of an atmospheric agent that effects a change in visible properties of the indicator material. There is also described a method for preparing an indicator device, and products derived therefrom. The indicator device may be used to detect oxygen, water, carbon dioxide, an amine and/or ammonia, or to indicate the passage of time.

Abstract: There is described an indicator device for detecting a change in atmospheric conditions, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being incorporated into one or more layers; wherein the indicator material displays different visible properties in different atmospheric conditions, and wherein the barrier section provides a semi-permeable seal configured to allow controlled flow to the indicator of an atmospheric agent that effects a change in visible properties of the indicator material. There is also described a method for preparing an indicator device, and products derived therefrom. The indicator device may be used to detect oxygen, water, carbon dioxide, an amine and/or ammonia, or to indicate the passage of time.