Abstract: A thermochromic device for use relative to a product container for providing a thermochromic indication of a temperature of a volume of product that is retained within an open inner volume of the container comprising a first image display and a second image display. The second image display and, possibly, the first image display could incorporate a layer of thermochromic material with an active temperature range. The active temperature range for the second image display could be above or below room temperature. The first image display can be thermochromic or non-thermochromic, and a thermochromic third image display could be provided. Where first, second, and third image displays are included, the second and third image displays could have active temperature ranges that are both above, both below, or to each side of room temperature. The image displays could be coupled to a side wall or to an upper surface of a product container.

Abstract: A device for detecting and providing an indication regarding one or more properties of a fluid retained in a bottle comprising a body member and a fluid property detecting substance, which can test for acidity, cork taint, or another fluid property, operably associated with the body member for detecting and providing an optical indication regarding one or more properties of the fluid retained in the bottle. The body member can have an open inner volume and the fluid property detecting substance can be disposed therein. A wall portion of the body member can comprise a semi-permeable barrier for allowing a one-way flow of fluid retained in the bottle into the open inner volume of the body member.