<div>Comment and question. </div><div><br></div><div>Comment: If you want to save etching solution and make your lines cleaner, don't remove all the extra copper from the board that isn't used. There is no need.</div>
<div><br></div><div>Question: Are these boards going to be used for any arduino work shops? If so, I have a cheaper and quicker solution to that waiting a little in the space already. </div><div><br></div><div>-Will C</div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 25, 2012 at 10:29 PM, David Smith <span dir="ltr"><<a href="mailto:david@davincisciencecenter.org" target="_blank">david@davincisciencecenter.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><a href="http://www.mgchemicals.com/products/prototyping-and-circuit-repair/prototyping/ferric-chloride-415/" target="_blank">http://www.mgchemicals.com/products/prototyping-and-circuit-repair/prototyping/ferric-chloride-415/</a><br>
<br>Two pieces of useful information:<br>

<br>each liter of CuCl2 is good for about 3.5 square feet of etching (see the usage instruction tab on the site above)<br><br>You cannot pour it down the drain (not a good idea, even if non-toxic since there might be some etching capacity left), but it can be mixed with washing soda (sodium carbonate - buy at a hardware or paint store) to precipitate copper carbonate, until the pH is 7-8 (see FAQ tab on the site above).<br>


<br>Dave Smith<div><div class="h5"><br><br><br><br><div class="gmail_quote">On Thu, Oct 25, 2012 at 9:21 PM, Randy Kramer <span dir="ltr"><<a href="mailto:rhkramer@gmail.com" target="_blank">rhkramer@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

Well, react energetically, maybe? ;-)<br>
<br>
(It depends how you mix it, to some extent.)<br>
<br>
But seriously, that's why we need input from a chemist.<br>
<span><font color="#888888"><br>
Randy Kramer<br>
</font></span><div><br>
On Thursday 25 October 2012 08:11:06 pm Pabut wrote:<br>
> Wouldn't metallic sodium explode???<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br></div></div>-- <br><font><font face="Verdana">David L. Smith, Ph.D.<br>Chief Scientist<br><br><img height="116" width="257"></font></font><font face="Verdana"><span style="font-size:10pt"><br>


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