On Monday, October 10, 2022 at 9:09:38 AM UTC-4, Michael F. Stemper wrote:
> On 09/10/2022 19.28, The Horny Goat wrote:
>
> > I was however horribly physically inept which is why most of my
> > university level chemistry lab notebooks had 1/2" burn marks from
> > concentrated sulfuric acid on most of the covers. The concentrated
> > stuff only takes a single drop to burn through cover and the first
> > 10-20 pages.....(yes this IS experience talking and I had more than
> > one like that...)
> Textbooks? I poured some of that on my right leg in high school.
>
> Fortunately, the teacher had good presence of mind and all but
> teleported me to the emergency shower. Half a century later, and
> I can't even find the scars. The double-knit slacks that I was
> wearing were shot, though.

I did similar with *dilute* sulphuric. Didn't hurt me, but the water
evaporated, and the acid became more concentrated. Eventually
the cloth it was spilled on crumbled to powder.

pt

On 2022-10-10, pete...@gmail.com <petertrei@gmail.com> wrote:
> On Monday, October 10, 2022 at 9:09:38 AM UTC-4, Michael F. Stemper wrote:
>> On 09/10/2022 19.28, The Horny Goat wrote:
>>
>> > I was however horribly physically inept which is why most of my
>> > university level chemistry lab notebooks had 1/2" burn marks from
>> > concentrated sulfuric acid on most of the covers. The concentrated
>> > stuff only takes a single drop to burn through cover and the first
>> > 10-20 pages.....(yes this IS experience talking and I had more than
>> > one like that...)
>> Textbooks? I poured some of that on my right leg in high school.
>>
>> Fortunately, the teacher had good presence of mind and all but
>> teleported me to the emergency shower. Half a century later, and
>> I can't even find the scars. The double-knit slacks that I was
>> wearing were shot, though.
>
> I did similar with *dilute* sulphuric. Didn't hurt me, but the water
> evaporated, and the acid became more concentrated. Eventually
> the cloth it was spilled on crumbled to powder.

Yes, I had a similar experience in college chemistry lab. I was careless
in washing out beakers after a lab and spilled some on my jeans. It
basically had no effect until the next time I did laundry and afterwards
noticed my jeans had 3 or 4 inch-sized holes!

Chris

On 10 Oct 2022 17:34:23 GMT, Chris Buckley <alan@sabir.com> wrote:

>On 2022-10-10, pete...@gmail.com <petertrei@gmail.com> wrote:
>> On Monday, October 10, 2022 at 9:09:38 AM UTC-4, Michael F. Stemper wrote:
>>> On 09/10/2022 19.28, The Horny Goat wrote:
>>>
>>> > I was however horribly physically inept which is why most of my
>>> > university level chemistry lab notebooks had 1/2" burn marks from
>>> > concentrated sulfuric acid on most of the covers. The concentrated
>>> > stuff only takes a single drop to burn through cover and the first
>>> > 10-20 pages.....(yes this IS experience talking and I had more than
>>> > one like that...)
>>> Textbooks? I poured some of that on my right leg in high school.
>>>
>>> Fortunately, the teacher had good presence of mind and all but
>>> teleported me to the emergency shower. Half a century later, and
>>> I can't even find the scars. The double-knit slacks that I was
>>> wearing were shot, though.
>>
>> I did similar with *dilute* sulphuric. Didn't hurt me, but the water
>> evaporated, and the acid became more concentrated. Eventually
>> the cloth it was spilled on crumbled to powder.
>
>Yes, I had a similar experience in college chemistry lab. I was careless
>in washing out beakers after a lab and spilled some on my jeans. It
>basically had no effect until the next time I did laundry and afterwards
>noticed my jeans had 3 or 4 inch-sized holes!

As I said, my acid burns were about 1/2" in size and if that had
happened in my clothing I would probably kept the pants for garden
work but not worn them in a work or school setting.

Incidentally there's a way to EXTREMELY CAREFULLY put your fingers
into liquid nitrogen without harm but it's easy if you're not paying
attention to get cold burns if you do it wrong.

In my case I ended up with ice forming under my nails but hand washing
with the water at the normal hot water setting quickly took care of
it.

It falls into the "Kids, DON'T try this at home!" category which is
why I didn't explain it but when I did this in the lab I next put
first a daffodil then a $1 bill into the LN and broke both in half.

Using the same technique I've seen an instructor put a plastic mold
frame in the shape of a hammer into liquid nitrogen then pour in
liquid mercury which he froze into the shape of a hammer then wearing
insulating gloves (to avoid melting the mercury with his body heat)
used the "hammer" to drive a nail ito wood.

On 10 Oct 2022 17:34:23 GMT, Chris Buckley <alan@sabir.com> wrote:

>On 2022-10-10, pete...@gmail.com <petertrei@gmail.com> wrote:
>> On Monday, October 10, 2022 at 9:09:38 AM UTC-4, Michael F. Stemper wrote:
>>> On 09/10/2022 19.28, The Horny Goat wrote:
>>>
>>> > I was however horribly physically inept which is why most of my
>>> > university level chemistry lab notebooks had 1/2" burn marks from
>>> > concentrated sulfuric acid on most of the covers. The concentrated
>>> > stuff only takes a single drop to burn through cover and the first
>>> > 10-20 pages.....(yes this IS experience talking and I had more than
>>> > one like that...)
>>> Textbooks? I poured some of that on my right leg in high school.
>>>
>>> Fortunately, the teacher had good presence of mind and all but
>>> teleported me to the emergency shower. Half a century later, and
>>> I can't even find the scars. The double-knit slacks that I was
>>> wearing were shot, though.
>>
>> I did similar with *dilute* sulphuric. Didn't hurt me, but the water
>> evaporated, and the acid became more concentrated. Eventually
>> the cloth it was spilled on crumbled to powder.
>
>Yes, I had a similar experience in college chemistry lab. I was careless
>in washing out beakers after a lab and spilled some on my jeans. It
>basically had no effect until the next time I did laundry and afterwards
>noticed my jeans had 3 or 4 inch-sized holes!

Very stylish!

Or would be in a few decades ...
--
"In this connexion, unquestionably the most significant
development was the disintegration, under Christian
influence, of classical conceptions of the family and
of family right."

On Tue, 11 Oct 2022 09:01:29 -0700, Paul S Person
<psperson@old.netcom.invalid> wrote:

>>Yes, I had a similar experience in college chemistry lab. I was careless
>>in washing out beakers after a lab and spilled some on my jeans. It
>>basically had no effect until the next time I did laundry and afterwards
>>noticed my jeans had 3 or 4 inch-sized holes!
>
>Very stylish!
>
>Or would be in a few decades ...

I didn't believe in showing off those holes given most of them were
near my lap and I usually didn't notice till I had leaned up against
the lab bench (usually black and waxed to prevent strong acids and
bases eating into the wood) and not noticing I had a problem till I
saw white power and dissolved sections of my pants! (And grateful the
pants had given their all before it had a chance to penetrate
somewhere rather more sensitive than denim!)