In article <009901c3a563$98f0f760$0c00a8c0@house>,
Les Newell <
lesnewell@...> wrote:
> Hi Stuart, I am taking my recipe from here:
> http://www.pacificsun.ca/~robert/pcb/cucl.htm
Couldn't get anywhere with that link I'm afraid. My browser tried and
after a long time gave up. I'll try again another time - the site may be
temporarily down.
> The only difference is that I am using methylene orange rather than
> bromophenol blue because it is cheaper and I can get it. The PH ranges
> for the two indicators seem to be virtually identical so methylene
> orange should be a good substitute.
It's two long now for me to remember the different charachtaristics of
indicators and my books are all in the loft.
> You don't have to use copper oxide. You can add scrap copper to the acid
> and leave it in a bubble tank for a couple of weeks. I have heard that a
> table spoon of used ferric chloride speeds things up.
> In the end I ordered from www.labpakchemicals.co.uk as they could supply
> everything I wanted at a reasonable price.
Looks interesting
> I tried phoning a local
> chemical supplier and their prices were about the same but they had a 2
> week lead time. The only disadvantage with labpak is that they have a 50
> pound minimum order
I'd have to think hard about how to make that value up I think.
> but I made that up with sulphuric acid for anodizing
I remember seing a "how to do it" article in Elektor some years ago - I've
still got it somewhere - looked interesting but obtaining chemicals seemed
to be a problem
> and some flourescein for a friend to trace a drain with. Flourescein is
> pretty harmless but even the slightest trace in water shows up bright
> green. As a kid I added some to a swimming pool once. The whole pool
> ended up flourescent green :-)
Ahh yes, tell me about it :-)
> Oh, by the way I have found a great way of removing ferric chloride
> deposits. I was given a tank that was in a terrible state but a few
> hours soaking in concrete cleaner brought it up like new.
Thanks for the tip.
> I know about Farnell. I have an account with RS components and they sell
> quite a bit of chemistry type stuff as well.
That's new with the latest catalogue. Farnell have had the stuff "for
years"
I use both and CPC too. Do you know about
http://www.megauk.com/ ?
for PCB stuff
Stuart
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