Re: Making Albumen Solution with Kodak Indicator Stop

Richard,
Thank you. You're right, of course! Kodak Indicator Stop I believe is 50 per
cent (dilute 1:63) . Just to add to my confusion several albumen formulas
list "glacial" acetic acid at 28%, some formulas refer to it simply as just
"glacial" which one would assume meant 99.5 percent, unless they're
referring to chemically produced as opposed to natural acetic acids. I
wonder how much of the use of acetic acid is "historic" and how much is
chemically necessary? Perhaps other acids would serve just as well.

~m

Richard Knoppow wrote:
> ----- Original Message -----
> From: "Michael Koch-Schulte" <mkochsch@shaw.ca>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Sunday, November 27, 2005 11:54 PM
> Subject: Making Albumen Solution with Kodak Indicator Stop
>
>
>> Not having immediate access to any glacial acetic acid I
>> substituted Kodak
>> Indicator Stop instead which is a 28 per cent solution
>> instead of 99
>> percent. I used 5 ml in a 500 ml solution of egg albumen.
>> I encountered no
>> problems with staining from the indicator or dyes used in
>> the stop's stock
>> solution. I think because the amount is so small the
>> effects are negligible.
>> The only ill effects were my eyes popping out of my head
>> when I saw how long
>> the tonal scale was for albumen -- 2.55. One question: can
>> someone explain
>> to me the purpose of acidifying the albumen solution with
>> acetic acid?
>> ~m
>> p.s. A beneficial spin-off of making albumen is that these
>> days I make a
>> mean hollandaise sauce ...
>>
> Beware that Kodak also makes indicator stop bath which is
> about 50% Acetic rather than 28%.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
Received on Mon Nov 28 16:22:39 2005