how to tell if oxygen absorbers are good
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 package is sealed, indicating that there is no oxygen in the package and the absorbers are good.
How can you tell if an oxygen absorber is bad?
The easiest way to tell if an oxygen absorber is good is to pinch the packet. If it feels 'soft' or powdery, the iron oxide powder is still in its original state, and it is good. If it feels 'hard' or like a solid wafer in the packet, it is completely spent and should be replaced.