[TheForge] Re: acid

[Steven Smith]

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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