Clear PCB Etchant

[frank olivieri]

You can reuse the ammonium persulphate until it turns blue. Thats when it is saturated with copper.

On Tue, 14 Sep 1999 07:50:13 PDT david leigh <dave909 at hotmail.com> wrote:
>
>I would be guessing the etchant you are refering to is ammonium persulphate. 
>This stuff has advantages, and disadvantages over ferric.
>I buy mine in a crystal powder form and add hot water. The positives are 
>fast etching, and it doesn't stain as much as the ferric does, its clear so 
>you can see the state of etching. The problem associated with both acids are 
>unless they are kept hot, then etching is slow. Also you cant reuse the 
>ammomium......
>
>To keep the stuff hot, the cheapest way is to go and buy a old electric 
>frypan from the op-shop or wherever and use this to keep the acid cooking.
>
>hope this helps
>
>Dave
>
>>
>>I am about to buy some more ferric chloride for some major etching but I am
>>wondering if I should try this clear, odourless etchant that is being sold 
>>these -
>>
>>days.Doing large boards with FC takes ages as I don't have a bubble tank 
>>and
>>this clear stuff claims etching time of 6 to 8 mins at 40-45 degrees.
>>As I am about to etch an MS20 main board I would like something a bit more
>>speedy.
>>Anyone used this clear stuff? How does it compare?
>>
>>cheers...
>>
>>Keith Winstanley
>>http://dspace.dial.pipex.com/town/street/sl67/
>>
>
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