Specifications

Oxygen indicators reveal the presence or absence of oxygen by changing color. When the pink colored indicator is first removed from its protective packaging and exposed to an oxygen rich environment it will turn blue in color within a few minutes. After placing it within a sealed treatment bag with the proper amount of Sandry oxygen absorber, the oxygen indicator will gradually return to its pink color over a period of 2-5 hours or when the oxygen content of the treatment bag reaches less than 0.01%.

Normally, each package of oxygen absorbers will bring one indicator and it should be pink if the package is sealed correctly. The color of the indicator may vary from bright pink to a reddish hue when the packaged is sealed, indicating that there is no oxygen in the package and the absorbers are good. Once the package is opened and exposed, you will notice the indicator rapidly changing color and turn blue.