Usually I put canister of silica gel or strips of vapor corrosion inhibitor in my cupboard (that contains many metal repair tools) to absorb moisture so that I keep the rust at bay.
So, How do I know if the canister of silica gel or strips of vapor corrosion inhibitor have lose its effectiveness in absorb moisture? (so that I can replace them with new ones. or do they really last a lifetime?)
Best Answer
Silica Gel often has a color indicator, either going from blue(dry) to pink(wet), or from orange(dry) to green(wet). By heating the gel to 250 °F for 2 hours, you can restore the gel to its dry state and reuse it.