Re: storage

This is not the place I purchased it from but the storage information matches what came with mine. It probably makes no difference either way.  From:

http://www.dfwx.com/answers.html

HOW TO STORE H202

The most important rule to remember is that undiluted H202 is EXTREMELY dangerous to eyes and is fatal if swallowed with still concentrated. Therefore, store H202 in a very safe location and NEVER put it undiluted in an unmarked bottle. Though extremely rare, there have been reports of fatality with H202 in concentrated form was mistake for water.

STORE H202 PRODUCTS IN THE DARK

H202 rapidly decomposes in a photo-reaction to U.V. light. This will cause the H202 to weaken in concentration and will cause the bottle to expand and possibly burst. We suggest SLIGHTLY loosening the cap (barely) to allow for any gas build up to bleed off rather than burst the bottle is stored for an extended period. This is particularly important for Jutrian RX. Storing in the dark means total darkness (though the brief refrigerator light when open or while mixing on under kitchen light is OK.)

DO NOT STORE IN FREEZER

There is a false view commonly taken that H202 should be stored in the freezer. If H202 is frozen at too cold a temperature, it will separate (decompose) as the water and H202 freeze at different temperatures. Do not store H202 in a freezer.

STORE IN REFRIGERATOR

Small bottles of H202 are best stored in a refrigerator as it is cold and dark. However, this is only the case if this is NOT accessible to children or incompetent adults. Otherwise, simply store H202 in any cool, dark location. Extra bottles are best stored in their box, the bottle upright, and the top SLIGHTLY loosened.

HOW LONG CAN H202 BE STORED?

At temperatures of 70 degrees or lower (but not freezing), H202 will decompose at a rate of less than 1% a year. Higher temperature will increase decomposition, but it not insignificantly unless the temperature is well over 80 degrees. Do not store H202 near a heat source such as a hot water heater.

Properly stored, H202 can be kept for many years without substantial lose of strength. Given its anti-bacteria and anti-fungus nature, H202 will never spoil.

The primary cause of H202 losing its potency is prolonged exposure to UV light from any source. It is very important to store H202 in the dark.

HOW OLD IS TOO OLD TO BE SAFE TO USE?

H202 is an extremely powerful agent against bacteria and fungus. A 20 year old bottle of any G.O.E. H202 product would still be safe to use if it had been stored in the dark. The only effect of aging would be that the concentration level of the H202 will reduce with time. However, it would have to drop to below 2% to begin to lose its ability to destroy any micro-organism that otherwise might contaminate other liquids.