Abstract: A variable color print of an image on a substrate with a reflective surface wherein, in one embodiment, a series of parallel differently colored lines are printed and a series of parallel mounds of clear ink are printed over the colored lines of printed ink to vary the reflective angle of the colored lines of printed ink as the viewing angle changes.

Abstract: A sampling and testing unit or bottle and method to perform presumptive testing of aqueous solutions to determine bacterial contamination if present, such testing to measure and indicate the presence of contaminants which, if in the presence of nutrients, will multiply in such a manner as to form gaseous products such as those which would be formed if the growth of same were to be a fermentation reaction with the evolution of gaseous material which would be easily observed by the positive displacement of the aqueous solution from an inverted tube or tubes incorporated into the body of the apparatus, in addition to the brilliant chromophoric confirmations tests as would be established by indicator color changes of materials incorporated in the nutrient media placed in the apparatus.

Abstract: The terrarium includes at least one glass sidewall serving as a viewing window, and a chassis formed of rigid plastic providing a bottom wall and a rear side wall. In one embodiment, the chassis includes a bottom channel formed in the bottom wall of the chassis, for mounting the glass viewing wall. In another embodiment, the glass wall is mounted to the chassis by a plastic frame member bonded to the plastic sidewalls of the chassis. The terrarium also includes a top screened closure member. In one embodiment, a channel for the closure member is formed in the upper portions of the sidewalls of the chassis, and in another embodiment, a channel for the closure member is provided by opposing F-shaped molding members fitted over opposing glass sidewalls of the terrarium.