I purchased h2o2 ...80 vols=24.2%
and I inserted a pair of yellowed PC keys on a small flask
Now....4 or 5 hours later I haven't see any changes...but maybe in a cup of days there's a surprise
btw, If at the local drugstore they sell the product as vols or volumens...you must divide vols/3.3 and you get the correct porcentage
in my case 80 vols/3.3=24.2 %
|