Hi
Saw some oxy acetylene torch work being done at a stone quarry on granite
slabs to give a textured finish to the stone. It was blowing, speltching,
off grapefruit segment sized chunks of stone at a great rate. The Romans,
or maybe Hannibal, used heat and vinegar to clear boulders and rock
outcrops as he crossed the Alps. Percussion drills, electrically powered
Kango hammers, I have used to break up concrete, no rotation just
percussion, works great.



On Fri, Aug 23, 2013 at 6:58 AM, RussellMc <apptechnz@gmail.com> wrote:

> > > CC HCL is about 65% AFAIR
> > Nah; HCl tops out at about 37%; that's all that will dissolve in water.
> > BTW, the younger daughter's science project showed that 30% HCl will
> dissolve turkey overnight, while 30% Sulphuric acid takes several days.  =
So
> while I normally would rate Sulphuric as more dangerous (probably because
> concentrated H2SO4 is ~98% (!)), HCl is nothing to sneeze at=85
>
> Conc H2SO4 - traditionally called Vitriol or Oil of Vitriol, is a VERY
> strong dessicant and causes massive skin disfiguration essentially
> insytantly. Its the acid traditionally used in disfiguring avcid
> attacks.
>
> Commercial conc HCL is FAR milder. Just majorly painful when poured on
> uyour face.Aske me how I know :-(.
>
> I've told the story here before I think so I'll give the super short
> version.
> When a teenager I reached up to an above window shelf in a dark
> workshop and a bottle of HCL that was on the ledge and had had the
> cork (made form cork) eaten by the acid. rotated down over my upturned
> face and covered face and eyes with conc HCKL. I had not lnown the
> acid was there (somebody else stored it) but had a fair idea of what
> it was. Taste is super super super ... string lemon and eyes burn
> almost maximally*. I did the blind lemon burning sprint for a front
> outside tap - probably 10 to 20 seconds away. and after a long long
> long period washing out my eyes et al ended up with no long term
> obvious ill effects.
>
> ___________________
>
> * Maximal eye burning pain may be what is experienced when surfacing
> from a swimming pool, head thrown back, so a floating patch of
> super-waterproof glue floating on the surface covers your eye. Nasty
> nasty stuff, 110% VOC, hard to remove (super waterproof) ... .   Took
> many many many weeks for eye to get back to normal but, again, no
> obvious long term effect.The fun we've had :-).
>
>
>                  Russell
>
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