On Fri, 21 Apr 2006 on 14:39, alienrelics wrote:
>--- In Homebrew_PCBs@yahoogroups.com, Len Warner <yahoo@...> wrote:
> > On Tue, 18 Apr 2006 at 15:31, Steve clarified:
> > >"Purified" water is just tap water that has had clorine gas added or
> > >been passed under UV to kill junk in it, but still has all the
>minerals.
> >
> > This seems to be another example of GBS's aphorism
> > "Two nations separated by a common tongue."
> >
> > This morning my father bought from the local chemist (pharmacy)
> > "Purified Water (Conductivity under 30uS) Non-Sterile 5 litre" @ £2.79
>
>Well, that's great but at least in the US (where 90% of the population
>is stupid for bottled water) you can pick up jugs of "purified" water
>all day in grocery stores that are as I described. Killed but not
>filtered or distilled. And then there is bottled drinking water, who
>knows what is in there?
Over here it's commonly called "mineral water" but it can be high or
low in mineral content. The better brands have an analysis on the label.
>Hence my clarification. Since you can figure out what I meant by the
>words I used, no need to try and drag me over the coals about it.
No personal criticism intended, Steve. Your posts are exemplary for
content and style. However, it wasn't until your clarification that I
understood what you had against 'purified' water.
I just wanted to point out that some things have different meanings
this side of the pond and, although we are aware of the common
differences, others aren't so obvious. As also in the 3 varieties of
Tarn-X: even those guys on the jewellery list seem to be at cross-
purposes over two different products.
'Sharpie' too: not a common brand over here, though probably
I could find it if I searched hard. Similar _function_ over here is
the "Staedtler Lumocolor Permanent" AV transparency marker,
also reported to be excellent on PCB, solvent smells like
a ketone/alcohol mix - hence the excellent penetration & grip.
Not compatible with ordinary printheads, though :-(
There's some interesting research going on in the group, it would
be wonderful if etching PCBs became as easy as getting photos
from a booth or business cards from a kiosk. It's interesting
physical chemistry too, not just boring reactions in a test tube
but where technology merges with skill and art.
When someone finds the right recipe we shall need to copy it
very closely: at the moment, we could barely share the making
of a consistent loaf of bread. (I'm being serious, that _is_ tricky.)
It might be a good idea to get into practice.
Well done, all you experimenters out there - but please make sure
you tell us clearly all your ingredients and steps.
Regards, LenW
--
Quote little, say much - as a general guide,
your reply should be bigger than your quote
- and following it, of course ;-)