I am wondering about developing film without starters, seems like local labs where are used to develop with the chemicals that way because is hard to import all the products. I tried to develop a roll and got the films back from digitalization and when I was correcting the white balance It was really hard work to get it right or almost (all photos taken outside have a huge amount of blue). I want to know it this effect is directly related to starters chemicals.

  • Was the film daylight balanced or tungsten balanced? Dec 2, 2021 at 4:10
  • @BobMacaroniMcStevens The only color negative films I'm aware of that have daylight or tungsten balance are cine films, for ECN-2 process (Cinestill, Visions3, etc.) Generally, negative films don't need this as color balance is easily corrected with filters in printing or digitally after scanning.
    – Zeiss Ikon
    Dec 2, 2021 at 14:27
  • @ZeissIkon Cinistill 800t etc. are C41 process. The remjet has been removed before respooling. Dec 2, 2021 at 17:55
  • @BobMacaroniMcStevens They are Visions3 film without the remjet; as such they are ECN-2 emulsion, and it's technically cross-processing to put them in C-41. Even Cinestill says this on their web site. They work in C-41 (as would be the case the other way), but with minor color shifts and higher contrast than would be the case in ECN-2.
    – Zeiss Ikon
    Dec 2, 2021 at 17:59
  • The development chemistry is the same. The remjet removal and and static charge mitigation for longer rolls are what differentiates the processes. I.e they require different machines and procedures but the chemical reactions are identical. Dec 2, 2021 at 19:16

2 Answers 2


Modern color films are incorporated meaning the dyes are placed in the emulsion during manufacture. We are talking, C-41 color negative film and E-6 color positive films. These films entail multiple coats of gelatin laced with light sensitive salts of silver and dye in a leuco state (Greek for white). The silver salts in each coat have been adjusted so that they are sensitive mainly to one of the three light primary colors which is red, green, and blue.

The topmost coasts are sensitive to blue, and they contain leuco yellow. The middle coats are sensitive green and contain leuco magenta. The bottom coats are sensitive to red and contain leuco cyan. Yellow, magenta, and cyan are the subtractive primary colors (complementary or opposite of the light primaries).

After exposure in the camera, a high percentage of silver salts have been exposed to light and thus developable. The job of the developer is to identity exposed salts of silver and reduce them to their two component parts which are silver and a halogen (Swedish “salt maker” usually bromine but could be chlorine or iodine).

As the developer works and reduce exposed silver salts, the halogen component is liberated and thus goes into solution into the waters of the developer. As more and more film is developed the developer solution thus gains more and more bromine. In addition to the developing containing agents that reduce exposed silver salts (black & white developing agents, there is a color developing agent. Its job is to unite with leuco dye and convert it to a full-blown dye by supplying a missing ingredient. All three subtractive dye globules are missing the same single ingredient.

The mechanisms is, as the black & white agent works, metallic silver is deposited in each emulsion in proportion to the exposing light. Each emulsion contains the appropriate leuco dye. As silver materializes it oxidizes as the waters of the developer contain dissolved oxygen. Silver oxide is the catalyst that caused the color developer to combine with an adjacent globule of leuco dye. The color developer now supplies a missing dye ingredient and the leuco dye now blossoms into a full-blown dye. All three leuco dyes are missing the same common independent. This is the marvel of these processes.

The C-41 and E-6 processes were chiefly designed to operate in automated processing machines whereby the chemicals of the process have an indefinite life span if correctly replenished. The replenisher formulas are balanced to replace exhausted ingredients and maintain the pH and concentration. The key ingredients of a developer:

  1. Water solvent
  2. Black & white developing agents
  3. Color developer
  4. Accelerator to set pH. Mostly developers work in an alkaline environment, the more alkaline the more energetic.
  5. Restrainer that retards development preventing the development of unexposed silver salts (usually bromine).
  6. Preservative that slows aerial oxidation and reacts with oxidized products to neutralize and limit the staining they induce.

The C-41 and E-6 formulas, being mainly for highspeed machines are sold as replenisher formulas. As such, when the machine is initially started, the replenisher solutions must be tweaked to make a working tank solution. The developer replenisher formula comes too strong and missing the restrainer. This is because the restrainer is bromine, a halogen which is liberated as the films develop. If the replenisher solution contained bromine, tank formula will now under-develop. Thus, using a straight replenisher formula tends to over-develop until the needed bromine is gained due to film volume. Plus, the pH will be wrong.

The E-6 and C-41 processes depend on a specific infusion rate. The top blue emulsions are wet first so development stars in the blue layers followed in time by green and red. The infusion rate is based on temperature and pH as this control the hardness of the emulsion. If the infusion rate is off and or the chemical makeup is wrong, likely the final color balance of the film will be off specification.

About the fixer -- No starter for the fixer, only dilute the concentrate to working tank strenght.

Starter for bleach -- The bleach solution is very pH dependent. The cyan, magenta, and yellow dyes used are organic and organic stuff lives in a world of narrow pH. The bleach starter sets the pH, if wrong the dyes revert to a leuco state. The working bleach tank depends on carryover fluid to set the pH. A fresh mix of machine type formula will not be at the proper pH without the starter.

  • The last paragraph or last 2 paragraphs are all that was really needed to answer the question. The list before is a useful addition. The rest of this is irrelevant to what was asked.
    – Zeiss Ikon
    Dec 2, 2021 at 18:13
  • Why cast aspersions on a learning opportunity? Did you know all that stuff? Dec 2, 2021 at 19:48
  • Well, yes, I did know all that stuff -- but then I've been reading a lot about photography for the past half century. My point is that "that stuff" isn't necessary to understand the answer to the question, it's an answer to an entirely different question that wasn't asked here.
    – Zeiss Ikon
    Dec 2, 2021 at 19:51

In C-41 replenishment chemistry, the purpose of a starter is to put the appropriate chemical into a "seasoned" state from the beginning, by introducing a controlled level of process byproducts to the fresh replenisher.

This is important for the color developer, in order to give an in-spec process; if the developer is too "hot" (as it would be without use of starter, that is, developing in straight replenisher) there may be different development rates between the three or four color layers in the film, or there may be overall overdevelopment (equivalent to a "push" process).

Uneven layer development will produce color shifts, and may also produce "crossover" -- most easily seen as a tint in shadows that's offset by an opposite tint in highlights (with C-41, this is most commonly greenish shadows and pink highlights); this crossover cannot be corrected away with filtration in RA-4 printing or with color correction applied to the entire scanned image, because correcting the shadows will make the highlights worse, and vice versa. Digitally, it can be corrected by separating the image into color channels and individually adjusting the curves for cyan, yellow, and magenta channels, but it's generally more trouble than it's worth for common "snapshot" images.

Note that in a small tank process (like developing in a home darkroom) using replenishment, it is possible to season your tank solution without a starter, at the cost of sacrificing several rolls of film. You would do this by developing some number of normally exposed films (Kodak document Z-131 may have clues on this, or you may have to simply proceed until your scans are free of crossover), without replenishment. Once you've arrived at a normal development condition, you can then continue replenishing according to Kodak (or other) documentation.

Also worth noting that neither bleach nor fixer really needs either starter or replenishment in small tank usage; both have substantial capacity (dozens of rolls per liter) and their working rate is inconsequential since both processes are (or should be) carried to completion. I've read that color casts can result from very wrong pH in the fixer, but never experienced that result with my own C-41 processing (using Flexicolor LORR).

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