Fw: Effect of Tween 20

From: Michael Koch-Schulte ^lt;[email protected]>
Date: 10/17/05-04:09:35 PM Z
Message-id: <01ad01c5d367$757f5ae0$a600a8c0@Sweetwood>

Michael Koch-Schulte wrote:
> It's about 50 per cent relative humidity in my darkroom. What I've
> taken to doing is putting on more than I need. Yikes like about 4 or
> 5 ml per 8 by
> 10. What I found out that if I run out of solution before I've made
> the first pass with the rod then the emulsion starts to get sticky
> and build-up on the paper (Stonehenge). I love the DMAX I get from
> Tween 20 but it's definately harder to work than an emulsion without
> present.
> ~m
> christine shepherd wrote:
>> hi michael,
>> can't really say as i've only used the formula with tween already
>> added, but i will note that yes, it seems to take more solution to
>> evenly coat that you would think. the variable i have noticed that
>> helps the most is proper ambient humidity when you coat. if it is
>> lower than 40%, i've had a rough time.
>> cheers,
>> christine
>> You have noticed that everything an Indian does is in a circle, and
>> that is because the Power of the World always works in circles, and
>> everything tries to be round.....The Sky is round, and I have heard
>> that the Earth is round like a ball, and so are all the stars. The
>> Wind, in its greatest power, whirls. Birds make their nest in
>> circles, for theirs is the same religion as ours.... Even the seasons
>> form a great circle in their changing, and always come back again to
>> where they were. The life of a man is a circle from childhood to
>> childhood, and so it is in everything where power moves.
>> ~Black Elk
>> ---------- Original Message ----------------------------------
>> From: Michael Koch-Schulte <mkochsch@shaw.ca>
>> Reply-To: alt-photo-process-l@sask.usask.ca
>> Date: Sun, 16 Oct 2005 20:44:38 -0500
>>> Does the addition of Tween 20 cause an emulsion to really absorb
>>> quickly into the paper? The reason I'm asking is that I cooked up a
>>> batch of Argyrotype emulsion last night and it seems that I require
>>> double the emulsion to coat the same area as compared to say VDB or
>>> Cyano. I added about .20 ml per 100 ml of solution during the
>>> preparation as suggested by Ware's formula. I'm wondering if I
>>> should have heeded the advice to add it prior to coating. What's the
>>> consensus about the addition of Tween 20 and Argyrotype? Thx.
>>> ~m
Received on Mon Oct 17 16:10:31 2005

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