[TheForge] Re: acid

[Craig Schaefer]

It's OK,  I have my foil hat on.


----- Original Message ----- 
From: "Steven Smith" <sos at alum.mit.edu>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Sunday, May 13, 2007 5:01 AM
Subject: Re: [TheForge] Re: acid


> Too late Jerry--all of our names are on the list now...
> 
> Steve
> 
> Jerry Smith wrote:
>> Maybe I am a little paranoid, but these days I
>> wouldn't talk about having some of these things on the
>> net. Something about Kaboom comes to mind.
>>
>> Jerry
>> --- Mike Spencer <mspencer at tallships.ca> wrote:
>>
>>   
>>>> ... use for the the others or different uses than
>>>>       
>>> the ones I already
>>>     
>>>> mentioned?
>>>>       
>>>> 1 liter of Nitric acid
>>>>       
>>> I've used it to etch my signature on art pieces
>>> where it seemed the
>>> best way.  Paint-on resist and  a wax dam around the
>>> polished
>>> signature surface.
>>>
>>> I've never done it but reputedly you can remove a
>>> broken tap or drill
>>> from mild steel by repeatedly dribbling concentrated
>>> HNO3 into the
>>> hole where the acid will attack the hard tool steel
>>> faster than the
>>> m/s and loosen the broken piece.  
>>>
>>> I've also used it to etch the brass ball bearing
>>> cages from British
>>> Leyland vehicles down to feathery thinness to make
>>> ear rings for a
>>> woman who raced a Mini.
>>>
>>>     
>>>> 1 gallon of crystaline NaOH  (lye)
>>>>       
>>> Excellent for degreasing/dewaxing a polished steel
>>> piece before
>>> attempting a heat or chemical patina.  Boil the
>>> piece in an NaOH
>>> solution.  Rinse thoroughly with water, possibly
>>> including
>>> neutralizing with dilute acetic acid and further
>>> rinsing.  When I was
>>> making a series of brass-inlaid belt buckles with
>>> heat patina as the
>>> final step, traces of wax & oil I had used as a
>>> lubricant for the
>>> chisels boiled out from under the inlay and spoiled
>>> the patina.
>>> Boiling the buckles in NaOH between the chiseling
>>> and inlaying steps
>>> fixed that.
>>>
>>>     
>>>> I know about safe handling of these chemicals
>>>>       
>>> thanks to OHSA
>>>     
>>>> training.
>>>>       
>>> Oh, good!  So I can skip the horror stories. :-)
>>>
>>> - Mike
>>>
>>> -- 
>>> Michael Spencer                  Nova Scotia, Canada
>>>       .~. 
>>>                                                     
>>>       /V\ 
>>> mspencer at tallships.ca                               
>>>      /( )\
>>> http://home.tallships.ca/mspencer/                  
>>>      ^^-^^
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>>>     
>>
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>>   
> 
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