[pure-silver] Re: Thiocarbamide Toner: now chemicals

I agree with you Jerry.
I still carry a scar on my forearm from school fooling around with conc.
acids to see how long they would take to burn the skin  -  Nitric was quite
slow I recall, but I can't remember now if the scar came from conc.
sulphuric or hydrochloric. But, as the saying goes, 'it never did me any
harm'! ;-)


http://www.worldbookoflithprinting.com

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Koch, Gerald
Sent: 24 June 2005 20:05
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Thiocarbamide Toner: now chemicals

> nitric acid ... nasty stuff

I remember back in my chemistry days discovering the following day that I
had gotten conc nitric acid on my hand.  There would be a yellow or orange
area of hardened skin, something like a callous.  No discomfort from the
initial contact though.  No lasting damage either.  

Now conc hydrochloric acid was different, this stuff started to "bite"
as soon as you contacted it and you could feel it.  You wanted to get this
stuff washed off!.  6 Molar sulfuric -- you wouldn't know that you'd gotten
it on your clothes until holes appeared when you washed them.  

I'm not advocating being careless with chemicals but our governments have
done a fine job of generating a great deal of hysteria on the subject.  The
result has been that many schools have dropped their chamistry labs and more
importantly for us their photolabs.  A few years ago I offered to teach a
photo course.  The school's response was that they couldn't do that "why the
students would have to handle CHEMICALS!!!".

Jerry
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