[pure-silver] tabular grains (was anybody using delta3200 + xtol in a rotary processor?)
- From: David Foy <dfoy@xxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 14 Jun 2006 13:39:44 -0600
Ryuji Suzuki wrote:
...
In any
heterogeneous silver halide emulsion a certain proportion of grains are
almost certain to be tabular. In fact, it's hard to make an emulsion
that has none, I am told.
This is not true. It is easy to make emulsion that is entirely
octahedral or cubic. ...
As you well know, no actual emulsion will be 100% anything. The form it
was designed to express will greatly predominate, but the desired form
will co-exist with other forms that are statistically less frequent.
They will be of practical insignificance, but they nonetheless exist.
The reason for making the comment was in regard to the misconception
that tabular grains had been invented and patented by Kodak. In that
context it is correct to point out that they are a natural form.
The sort of opinions expressed here are irrelevant because there are
many huge factors that influence the photographic properties of the
final product. ...
The subject under discussion was a Kodak patent, regarding whether or
not it protected tabular films in general, and the comment (which was
not an opinion) was relevant.
DF
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