Re: OT Stop bath

[Peter J. Alling]

A lot of this is rule of thumb engineering.  Kodak is a repository of a 
lot of early research, which they've been
refining for 100 years.  I usually aim for about 3% myself. 

Scott Loveless wrote:
On Mon, 21 Mar 2005 13:09:47 -0500, Peter J. Alling
<[EMAIL PROTECTED]> wrote:
 

Simple "white" vinegar is usually 5% out of the bottle, you shouldn't
have to dilute it.
   

You are correct, sir.  According to the MSDS from Kodak, indicator
stop is between 1-5% acetic acid when properly diluted.  The
concentrate is 85-90% acid.  Kodak says a 1:63 dilution.  This means
that if you properly dilute the stuff you should end up with a
solution that is about 1.4% acid.  Don't ask me where they learnt
their cypherin', but I'm guessing Kodak's got some sloppy researchers
mixing stop.  Anyway, vinegar with 5% acid should be used 1+3 if you
wanted to maintain Kodak's prefered dilution.
 


 


--
I can understand why mankind hasn't given up war. 
During a war you get to drive tanks through the sides of buildings 
and shoot foreigners - two things that are usually frowned on during peacetime.
	--P.J. O'Rourke