Darkroom Word Badges

the circle of craft, in which mastery gets you – nothing. Like old man in speedo; like strutting around the wading pool wearing a snorkel. Doing it the difficult way doesn’t make you better at the hard stuff.

Words come together over time as people try to say something meaningful about something new. We start with existing words, then alter them, or just use them differently. A recent example, wrong to me, but not to the lab selling the printing service. They call a C-Print from a laser printer “continuous tone” — what they think the C means. To me, C meant type C, a Kodak product from 70 years ago. Their sales group used the “chromogenic” print from the research department to brand their color printing paper. Today those papers are RA-4, after the chemical process. I’ve also heard people think C meant chemical. Time is timeless, meanings aren’t.

The need to distinguish is a driver in this pushing of meaning – molding distinctions as some new method manages to breath. Users may introduce a word. Labs have to route work to the group with that skill, so we have quick-print, machine-print vs. hand-print.

In the photolab printing has moved from contact, to projection, and enlargement. Kodak’s enlargers were Projection Printers until moves (cinema) dominated the market. Making “projection prints” didn’t make sense there; they projected prints onto a screen for Saturday’s popcorn crowds. In the 90s distinction was made in film labs between prints made using an optical printer or a digital printer. Kodak supplied emulsions to them as well as color paper for commercial and private darkroom printing. Addressing the exposure differences between incandescent, and LED/Laser lights meant devising an emulsion that could be printed in two different manners. From a piece of film in an enlarger, or from a digital output using and LED or Laser system.

Kodak literature lifted the terminology from the film world: optical, digital. An optical print or a digital print. The first publications put optical in quotes; by 2003 the quotes had been dropped. The word had changed, it burst out of quotes and was born as an Optical Print.

“There are two major differences between optical and digital printer balancing procedures. Optical printers typically are balanced on one density point; a gray target on a standard portrait (often known as a “Shirley”) negative. A typical balance is approximately 0.80 red, 0.80 green, and 0.80 blue. Digital printers typically balance on multiple density points ranging from just above the D-min of the paper to the D-max. Because of these multiple balance points, the printer can adjust for a straight line response if the process varies from normal aim through most of the density range.”

Pigment Patents

I do all ‘that stuff,’ for the same reason you don’t.

We are on all the time; some onliners have little other life. Learning from them is following apt to lead you to a parking lot at the back lot of their career. Beware is the advice. Beware things like “it can’t be pigments cause they won’t fit through those nozzles. “(from the purchasing agent from the Pela Store)

Just like germs didn’t exist: cause nothing that small can hurt you.

Reading patents isn’t an idling for me. I do it to know more than I did; an easy way of following people with degrees, not just degrees of opinion. Some patents are instructional – these patents contain much more foundation information than typical. They seem written as a farewell address; written at a apex of the industry, the company, even the researcher.

I seek patents written by the major companies involved in photography: Kodak, Fuji, Epson, etc.

In the following, note the definition of “pigment,” and “dye.” These are the current uses of the words in colorant chemistry.

“The inks used in the various inkjet printers can be classified as either pigment-based or dye-based. A pigment is a colorant that is insoluble in the carrier medium, but is dispersed or Suspended in the form of Small particles, often Stabilized against flocculation and Settling by the use of dispersing agents. A dye is a colorant that is molecularly dispersed or dissolved in the carrier medium. In either case, the carrier medium can be a liquid or a Solid at room temperature. Commonly used carrier media are acqueous based and include water as the major constituent, water miscible humectants, water-miscible organic co-Solvents and Surfactants.”US 2005/0139122 A1
— gamut increase 1997 Kodak
The invention provides a pigment set comprising a magenta pigment, a yellow pigment, and a cyan pigment wherein the normalized spectral transmission density distribution curve of the cyan pigment has a density between 0.66 so and 0.94 at 600nm and a density between 0.83 and 1 .0 at 610nm, and the magenta pigment has a density between 0.25 and 0.93 at 520nm, a density between 0.9 and 1 .0 at 540nm, and a density between 0.9 and 1 .0 at 560nm. The invention further includes an imaging system containing such pigment set and a method of imaging there with. EP0831132A2
Which was a long time ago in a growing technology; 25 years. The specifics are still useful as guidance to current readers.

Small pigments have been around for decades (the 90s). There are at least two significant methods of making small pigments. One uses filtration and dispersion to get same size particles. The other uses compression, grinding then filtration dispersion. This method assure shape and size of pigments.

U.S. Pat. No. 5,679,138 describes preparation of nanoparticulate dispersions and inks

U.S. Pat. No. 6,494,943 B1 describes inkjet inks containing colored pigments having one or more desired parameters including a filterability Such that when in a liquid medium, 100 mL having 10% solids of the colored

US 5990197 ESCANO
US 0121093 OGINO
US 0003112 DEMEJO

Pigment inks prepared with mean pigment particle sizes in the preferred range of 0.100 microns
or less, fired continuously, and reliably for longer periods of
time and contributed to longer printhead lifetimes. 2005

Dye Film :note

Will a sheet of fixed out arista litho film hold dye? A question from a few days back that I have decided to post more about.

Two sheets of film; both dyed in cyan dye. The upper one with the arch of color is Kodak matrix film partially washed off. That’s what the arch is: no emulsion. The cyan is fogged, age mottled emulsion after being dyed.

The lower, empty, blank, unstained square of film is Arista Litho that has been stained with the same cyan dye as the matrix film — stained for over 8 minutes — that stain drained off with less than 40 seconds in rinse. It didn’t base stain — there wouldn’t be highlight carry over.

This isn’t a stripped emulsion, we aren’t at film base.

What does this demonstrate?

Try it. No matter who you hear an answer from, try the experiment in your studio with your equipment. Set your own standards; have your own goals.

Why did I do this? Because I wanted to know; to confirm my memory of making matrix films from true raw, so ever many years ago. Dye won’t stick if an emulsion won’t, however, a dye sticks to ‘soft’ gelatin — gelatin of a type. It will stick to many types of colloids — collodion, gelatin, albumin, etc. It isn’t easy to get all things arranged: emulsion, dye, receiver; all compatible, durable, useable to your purpose.

Get your own hands dirty.

Dyers Fingers: Cyan Thumb