From: Jack Fulton (jefulton1@attbi.com)
Date: 09/09/02-09:44:48 PM Z
I believe we must look @ the formula(e) to see what it is doing and why.
There may well be another way to do it. But, as we all know, sometimes not.
For instance, when you look @ what Bob Schramm does w/dags, he goes the
fuming mercury way . . but he knows what he is doing.
One of the very best instensifiers is a mercuric chloride formula. this
has been taken from the market (used be known as Victor's) and it is stated
everywhere for us to NOT use the chloride.
Jack
> Thanks, Jack. I asked the question because it seems quite a few of the old
> formulae I am looking at from the early part of this century call for nitric
> acid, so my question probably is moreso is glacial acetic a strong enough
> acid to substitute...in other words, would glacial acetic be like using a
> hammer and nitric like using a nuclear bomb, you know? As in, totally
> unnecessary today?
> I know a lot of the old books have mercury formulae also, so I am
> assuming they were not as aware of the dangers of chems at that time.
> chris
> ----- Original Message -----
> From: "Jack Fulton" <jefulton1@attbi.com>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Sunday, September 08, 2002 9:37 PM
> Subject: Re: acids
>
>
>> Holy Cow . . nitric acid is a lot tougher, rougher and meaner than acetic
>> acid AND also sulfuric acid. It is nothing to mess with at all.
>> AND, if you mix hydrochloric and nitric acids you will achieve 'aqua
> regia',
>> or, royal water. this will dissolve gold and platinum.
>> On the order of being dangerous it is:
>> 1. acetic acid normal
>> 2. glacial acetic (a concentration)
>> 3. hydrochloric acid
>> 4. sulfuric acid
>> 5. nitric acid
>> 6. aqua regia
>>
>> Either 28% acetic acid or glacial acetic acid are our mainstays in
>> photography. In a pinch, a clear vinegar could be used as a stop also
>> Hydrochloric acid in a dilute form used to clean fireplace soot dirty
>> ceramic tile and concrete driveways is called muriatic acid.
>> Sulfuric acid is used in car batteries and will etch away your clothing
> in
>> a short amount of time.
>> Nitric acid is laboratory stuff.
>> Aqua regia is for professional people who know what they are doing .. .
>> only.
>>
>> Jack
>>
>>> From: "Christina Z. Anderson" <zphoto@montana.net>
>>> Reply-To: alt-photo-process-l@sask.usask.ca
>>> Date: Sun, 08 Sep 2002 11:07:39 -0600
>>> To: Alt Photo List <alt-photo-process-l@sask.usask.ca>
>>> Subject: acids
>>>
>>> I'm still working on this mordancage thing. Question: what is the
>>> difference between acetic acid and nitric acid? I mean, in activity, as
> I
>>> know the compounds are different. It seems probable that the acetic is
> more
>>> innocuous perhaps? Is nitric in any way dangerous to use, e.g. fumes
> etc.?
>>> Any comments would be welcome to a non-chemist such as myself. (I did
> the
>>> mistake of doing early admissions into college, missing my senior year
> in
>>> highschool, and avoided the high school chem class and college as well.
> What
>>> a mistake.)
>>> Chris
>>>
>>
>
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