Clear PCB Etchant

[david leigh]

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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