Homebrew PCBs

Stefan Trethan wrote:
> On Sun, 21 Aug 2005 22:10:56 +0200, lcdpublishing  
> <lcdpublishing@...> wrote:
> 
> 
>>hydrogen peroxide (H2O2), is this the same as what I can purchase at
>>the local drug store? Or, is there a stronger solution or something
>>I have to get at a specialty supplier?
> 
> 
> often the drug store stuff is only 3%, you want around 30% or you add too  
> much water.
> 
> 
>>hydrochloric acid (HCl), I know I have seen this for some purposes
>>but can't recall common uses - toilet bowl cleaner perhaps?  Again,
>>where would I purchase this, and is there a certain strength I
>>should look for?
> 
> 
> Around 30% is a common strength again, it has many uses, cleaning stuff  
> like bricks, toilets, ...
> 
> I get both chemicals at my chemists shop. I don't remember the price  
> exactly, but it is well below 10eur for a liter each, and that lasts you  
> quite a while.
> 
> 


Another possible place to get > %10 H2O2 is a hairdressers supplier. I 
think the one near me sold it up to 18%. Anyone had problems with this 
stiff decomposing over time ?