did about 5 badger and then 5 large coyote. the peroxide seems flat, now...the last coyote batch are still smelly, but seem to whiten less than the badgers.
I used 1/2 qt 40% can cut it by 25% water. Later added a 1/2 qt of 3%.
How many skulls per qt. is normal? when is it depleteed?
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Maybe when the "next batch seems to whiten less?"
You need to go back to chemistry 101. Hydrogen peroxide is H2O2 and of course water is H20. When you add water, you excite the H2O2 into releasing that extra hydrogen atom. Opening H2O2 to ambient air does the same thing. It didn't "go flat". It did what chemistry and physics tells you it should do. It reverts back to water where it came from.
Trust me, I won't teach 101. As Stephen Rogers so succinctly reminded me, there IS water in peroxide. 40% peroxide has 60% pure water in it to begin with. It also has and extra OXYGEN atom in it. Regardless of my brain dump, adding water only dilutes it more and opening the bottle or container of peroxide accelerates the release of that extra oxygen atom to the atmosphere. Heating it up or storing in sunlight does the same thing, only faster.
now you got it... That's why we store it in a cool dark place because of its instability to light..
Just toss is and get more, that's what you have to do when you clean skulls. Remove and replace.
peroxide only lasts about 6 to 8 months