Homebrew PCBs

Thanks!!

 

It’s interesting how different combinations of the three components changes the way the etch process happens.  If I go lighter on salt and more peroxide the etchant turns a deep green and there’s lots of flecks (precipitate?).  If I let that sit after using it, it turns blue.

 

More salt generates more fizz and seems to keep the etchant blue, but does nothing to improve speed.

 

More vinegar seems to do nothing at all.  

 

It seems like if I keep adding copper and a bit of peroxide I can keep the reaction going for a long time.. but when it stops it doesn’t seem able to be revived.

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Thursday, August 3, 2017 9:27 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: Salt/Vinegar/Peroxide

 

  

You can get much stronger HP at your local beauty supply store.  It is labeled as developer and comes in different concentrations or volumes.  10 volume 3%  20 volume 6%  30 volume 9% 40 volume 12%.

I usually get  16oz bottles of  40 volume clear developer for around $4.00 or less if on sale.

DuWayne



 


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