My wife owns a beauty shop so I already have a gallon of the good stuff.
:-) But she did buy it from Sally Beauty Supply.

Thanks,

Dave

On 3/22/2019 7:31 PM, Donald H Locker wrote:
> I found Sally Beauty Supply to be a good source for H2O2. I recall the
> "volume" rating is a bit more than 3x the concentration, so "30
> Volume" H2O2 is 10% concentration.
>
> Donald.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ <http://www.georgedillon.com/web/html_email_is_evil.shtml>
>
> On 2019-03-22 5:09 p.m., Steven Greenfield AE7HD via Groups.Io wrote:
>> "Could you explain more on how to make the mix with the copper wire?
>> I like the idea of less corrosive fumes."
>>
>> Cupric chloride is what that sounds like. If you mix hydrochloric
>> acid and hydrogen peroxide, then etch copper, you end up with cupric
>> chloride. As it gets overloaded with copper, it changes. Simply
>> bubbling air through it to add oxygen, or adding a little more H2O2
>> converts it back to cupric chloride suitable for etching again.
>>
>> James Newton kindly saved a lot of posts from here pertinent to
>> making PCBs. From http://techref.massmind.org/techref/pcbetch.htm
>>
>>
>> ????? Hydrochloric acid and Hydrogen Peroxide aka Cupric Chloride
>>
>> Chuck Knight says: ^
>> <http://tech.groups.yahoo.com/group/Homebrew_PCBs/message/28868>
>>
>> ??? "The recipe was simple. 2:1 ratio of H_2 O_2 ?to HCL. The HCl was
>> ??? 20% concentration, in a toilet bowl cleaner called "The Works" that
>> ??? I purchased at WalMart for $0.94. The H_2 O_2 ?was also from
>> ??? WalMart, from the pharmaceuticals section. Whatever they had...
>>
>> ??? The etchant works impossibly slow at first...threw in a sacrificial
>> ??? bit of copper wire, and let it dissolve all night. Once it turned
>> ??? from blue to emerald green, it worked beautifully for 4 boards. Took
>> ??? several hours to etch the boards. It did, however, turn into an ugly
>> ??? olive green that needed to be refreshed with a capful of H_2 O_2 ,
>> ??? 3/4 of the way through the process."
>>
>> Erik Knise advises: "At 20% concentration of HCL and 3% (standard
>> over the counter pharmacy) H_2 O_2 ?you should have a ratio of ~1:3
>> by weight (volume is about the same). So you would need 3 times as
>> much H_2 O_2 ??to HCL. The board should have etched within a few
>> minutes."
>>
>> *DANGER:*?With 20% HCL (from a pool supply) and 30% H_2 O_2 ?(hard to
>> find, try a chemical supply store) mixed 2:1, once a little of the
>> copper gets into the solution, the copper will literally foam off the
>> board and the etching will be done in a minute! ^
>> <http://www.youtube.com/watch?v=OTGZcY7WyYI>
>>
>> Erik L. Knise's Cupric Chloride Echant calculator
>> <http://techref.massmind.org/techref/pcb/etch/CuCl2Calc.htm>?helps
>> you design the perfect CuCl2 echant for your needs.
>>
>>
>> --
>> Steven Greenfield AE7HD
>>
>
>