Month: August 2023

How Many Pages Does It Take

Posted on Posted in babl, fauxtons, morning wood, the fora, the meta2 Comments

to answer the hobbyists rudimentary question:

“Can anyone give me the times to develope(sic) FB paper in Ilford Multigrade paper developer. Ilford Ilfostop and Ilford rapid fixer? Thank you!”

in the land of time and temperature, it helps to be able to take the temperature of the room.

The direct answer is: https://www.ilfordphoto.com/amfile/file/download/file/1828/product/709/

Multigrade Paper Developer diluted 1+92 minutes1.5 to 3 min useable range
Multigrade Paper Developer diluted 1+143 minutes2 to 5 minutes range
Ilford Stop bath 1+1910 secondsup to 30 seconds
Ilford Rapid Fixer 1+41 minuteup to 5 minutes
absolute beginnings for Ilford Chemistry

… after more than 300 posts in the topic, it continues. Although, they no longer even try to answer the question, instead they answer each other — address each other as adversaries in a game of King of the Mountain. Among some, it seems they are playing Liars Dice, a popular game among the barstool photographers.

The simpler the question, the longer, more convoluted the answer. After enough time, we get into our deeper selfishness — pull out our basics.

how many old timers does it take to kill a thread.

Wiley is always throwing someone out of the store: Truitt and White.

Sadly, Mr. Bill gives credit to the vainglorious, and in doing so, takes it from himself. I wonder where he worked that he managed their color systems and is unable to see the errors Wiley makes.

The large portrait chains were called Kidnappers, since they offered free, or loss leader photos, then charged increasing amounts for reprints. The largest of the chain studios was Olan Mills, doing $475million (est) in 1993. Other studios: Varden, CPI in Sears, PCA in K-Marts, American Studios in WalMarts. Approximately $5B business in portraits in the US.

Notes on…

Posted on Posted in overnight notes

Keyed color processes

Avoiding distractions

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
Benzotriazole10 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