Sorry David this seems complicated to me (math moron that I am)  I have a 
sixteen ounce bottle (used formerly to house 3% store- bought HP) and I want to 
know how much 35% HP to put in if I fill it with DW.  It has to be really 
simple I'm afraid <lol> dee

On 14 Apr 2010, at 05:01, David Bearrow wrote:

> Oy. Look at it like this:
> 35% = 100, divide both by 2
> 17.5% = 50, divide both by 2
> 8.75% = 25, divide both by 2
> 4.375% = 12.5
> 
> What that mean? You take the 35% peroxide and mix in an equal amount of
> water and it divides it in half making it 17.5%. If you started with 1/4 cup
> of 35% peroxide mix in 1/4 cup water. This gives you 1/2 cup of 17.5%
> peroxide. Mix in 1/2 cup of water to the 1/2 cup of 17.5% peroxide you just
> made. This gives you 1 cup of 8.75% peroxide. Mix in 1 cup of water to the 1
> cup of 8.75% peroxide you just made. This gives you 2 cups of 4.375%
> peroxide. To me thats close enough to 3.5%.
> 
> David
> 


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