Homebrew PCBs

--- fenrir_co <fenrir@...> wrote:

> --- In Homebrew_PCBs@yahoogroups.com, William Carr
> <Jkirk3279@...> 
> wrote:
> >
> > 
> > On May 7, 2006, at 12:07 PM, fenrir_co wrote:
> > 
> > > You can get 40 volume H2O2 (peroxide, hair
> bleach) at Sally Beauty
> > > Supply without needing a license or whatnot to
> purchase it.
> > 
> > 
> 
> 'Volume' doesn't mean percent. I'm not sure of the
> exact conversion, 
> but I believe the strength is only about 15/20%.
> They have 60 volume 
> as well, but only in cream, not in pure liquid.
> 

A bottle I looked at said 20 vol/6% on the label, so
it looks like the scale factor is 0.3% per volume. So
40 volumes would be 12%. I saw somewhere what this
volume business is all about but I can't quite recall
it now. I think it had to do with the weight of the
solution.

- YD.


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