“… fans won’t work..” forcefully said. Why so strong a statement. Does the speaker keep current with that field? Not likely, since they made their fan decision last decade .
They are defending their prior commitment, as well as pushing for dominance of the topic.
These are the positions that stop knowledge as they halt group growth.
landscapes format formula
misread to interpret our bias. we read though our eyes
why does he do it
why do you let him — it hurs; but who, and how
a mis-reader: wiley is very widely mis-read.. suffers from wide misreading of such items as the Carmel Pinecone
DW: freshman scan .. a QC crit..
If yo have a point, make it.
craft can’t be difference [defense] — no elite
Dogleash Mysteries
We begin in gasps for air & become capable of words and walks
are poems are backlit [projections]
some people turn every answer into a polemic— making the forum a pandemic of polemics
“One very important difference between color and monochromatic photography is this: in black and white you suggest; in color you state.” – Paul Outerbridge
“Black and white are the colors of photography. To me, they symbolize the alternatives of hope and despair to which mankind is forever subjected.” – Robert Frank
Dithering and the ink/pigment print. Pounding one contrast into another.
karoshi”, or “death from overwork”
Three Letters… Separated by amateur hours:
did he gain clarity, typing skill, or something else.
26-May-2012, 03:50
If needed, add more BTZ, in 25ml / liter amounts. However, you can only do this twice or three times more before you kill your developer.
in a thread: Benzotriazole (BZT) use in defogging bromide papers
years later, 2023:
in thread: Benzotriazole Questions
BenzoTriAzole is the way the components should be divided up, hence, BTA is the proper acronym. BTZ is seen often, but is erroneous.
Note: the used acronym, in photoland is BZT, or BZTA, not BTZ. The enthusiastic expert (above) is typing, or thinking, out of sync. Chemists often use BZT as shorthand. The less used form, although the one preferred by emulsion chemists is: BTAZ
As in:
Do not use denatured alcohol, as the denaturant can be harmful to photographic processes.
Do use alcohol, iso propyl alcohol or other water miscible organic solvents. I usually use 1% in DW though.
For a 2% solution of BTAZ in alcohol use 2 g BTAZ in 98 g alcohol. This makes 2% wt/wt BTAZ in solvent.
This is true for any mixture regardless of density. That is why weight is better than density.
Be cautious in handling benzotriazole, especially in powdered form. It is extremely toxic so avoid inhaling the powder particles. I recommend you download the MSDS before using.
---
The effects of benzotriazole and bromide are more. detectable at low densities. This is obvious with the observed values for base plus fog. As development time increases or when agitation is employed the effect of bromide becomes insignificant compared to that of benzotriazole as the density continues to build up with time, the effect of the benzotriazole level ceases to be a significant factor in the resulting contrast and speed values.
benzotriazole has an effect on the developed density levels with Increasing development time. This is more evident at the lower exposure levels.
common acronyms to facilitate discussion.
TAI: 4-hydroxy-6-methyl-1,3,3a,7-tetrazaindene
PMT: 1-phenyl-5-mercaptotetrazole
2-MBI: 2-mercaptobenzimidazole
6-NBI: 6-nitrobenzimidazole
MBTA: 5-methylbenzotriazole
Sodium carbonate (anhy)
10 g
Benzotriazole
10 g
Water to
1 litre
Ilford IBT
[sidebar on use in film is in my PanF for masking post ]
Dmax of BW paper.
is determined by the paper. The shape of the curve is altered by development. Kodak D-72 (Dektol) can be used as a reference developer when discussing curve shape. Reproduction image used by the eye is based upon toe and shoulder shape. Sharp shoulder and high Dmax is less often chosen that a softer shoulder with lower Dmax. Open shadow seems darker even with the same Dmax. Usual Dmax of glossy paper is 2 -> 2.3; with matte paper is 1.8-> 2.0. Specialty papers (lithography) have Dmax of 3.2
Goniophotometry: the measure of density as a function of angle of light and viewing system
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