ColdMark™ Freeze Indicators
• Definitive violet color change at response temperature
ColdMark monitors the temperature of drug and medical products, vaccines, diagnostic test kits, cosmetics, paint and chemicals. Three fluids are contained inside ColdMark’s capillary tube/bulb piece-one colorless, one green and one violet fluid. The clear colorless fluid, located in the bulb, is formulated to freeze at the response temperature.The green fluid acts as a barrier between the violet and clear fluids. When ColdMark is exposed below the response temperature, the clear fluid contracts, drawing the green and violet fluids into the bulb.The bulb changes from clear and colorless to cloudy with streaks of violet. When the ColdMark indicator warms to above the response temperature, the bulb changes irreversibly to a uniform violet color. Thus, there is a visible, definite indication of exposure to freezing temperatures. ColdMark can be stored in temperatures from 43°C to no colder than 5° above the response temperature. Composed of a PVC top covering and cardboard, pressure sensitive adhesive for mounting.
