Agfa/Ansco 135 is a warm-tone MQ paper developer built around Metol, hydroquinone, sodium sulfite, sodium carbonate, and potassium bromide. It is not a dramatic brown-tone developer. It is a restrained warm-black print developer that can be useful when you want a softer, warmer print tone than a standard cold or neutral paper developer.
Plain-English Summary
This formula develops exposed silver halide into metallic silver while holding back fog and pushing the image tone toward warm black. The high bromide level is the key feature. It slows development slightly, helps control fog, and can warm the image tone, especially on warm-tone or chloride-rich papers.
It is a good developer to test when a standard developer feels too cold, too snappy, or too hard-edged.
Best Use Case
Agfa/Ansco 135 is best used for warm-black silver gelatin prints on fiber paper, especially when you want a controlled print with a slightly warmer character before toning.
It is also worth testing with silver gelatin paper negatives, but it should not be assumed to behave like a standard high-energy print developer. The bromide content can reduce effective paper speed and may require more exposure.
Formula
Stock solution to make 1 liter.
| Ingredient | Amount | Unit | Function | Practical Note |
|---|---|---|---|---|
| Warm water, about 125°F / 52°C | 750 | ml | Solvent | Warm water helps the dry chemicals dissolve. |
| Metol | 1.6 | g | Developing agent | Gives soft image start, shadow detail, and general developing action. |
| Sodium sulfite, anhydrous | 24 | g | Preservative | Slows oxidation and helps the developing agents stay active. |
| Hydroquinone | 6.6 | g | Developing agent | Builds density, contrast, and stronger blacks. |
| Sodium carbonate, monohydrate | 24 | g | Alkali / activator | Raises pH so the developing agents can work. |
| Potassium bromide | 2.8 | g | Restrainer | Controls fog, slows development, and helps produce warmer tones. |
| Cold water to make | 1000 | ml | Final volume | Add after all chemicals are dissolved. |
Important carbonate note: the formula calls for sodium carbonate monohydrate. If using anhydrous sodium carbonate, use about 20.5 g as a practical equivalent. Do not use 24 g anhydrous unless you intentionally want a more alkaline version.
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What Each Chemical Does
Metol starts development smoothly. It is useful for building detail without immediately driving hard contrast.
Sodium sulfite protects the developer from rapid oxidation. It also helps the developer remain cleaner-working by supporting the developing agents in solution.
Hydroquinone adds energy, contrast, and deeper blacks. In this formula it works with Metol as a classic MQ developer pair.
Sodium carbonate makes the solution alkaline. Without enough alkali, Metol and hydroquinone would work slowly and weakly. Too much alkali can make the developer more aggressive and increase fog risk.
Potassium bromide is the restrainer. It holds back unexposed silver halide, helps prevent fog, and contributes to the warmer tone character. More bromide can increase warmth, but it can also slow development and reduce effective paper speed.
How the Formula Works Chemically
Exposed silver halide crystals in the paper emulsion contain a latent image. The developer reduces those exposed silver halides into metallic silver. That metallic silver forms the visible black image.
Metol and hydroquinone do the reducing work. Sodium carbonate activates them by raising the pH. Sodium sulfite slows oxidation so the developer does not die too quickly. Potassium bromide restrains development in the unexposed areas, helping keep the highlights clean and reducing chemical fog.
The warm-tone effect comes mainly from the balance of restrained development, paper emulsion behavior, and the relatively high bromide level. The paper matters a lot. Warm-tone fiber papers will usually show the effect more clearly than cold-tone papers.
Mixing Order and Handling
Use clean mixing tools and a dedicated graduate.
- Add about 750 ml of water at about 125°F / 52°C.
- Add the Metol and stir until dissolved.
- Add the sodium sulfite and stir until dissolved.
- Add the hydroquinone and stir until dissolved.
- Add the sodium carbonate and stir until dissolved.
- Add the potassium bromide and stir until dissolved.
- Add cold water to make 1 liter.
- Let the stock cool before use.
Do not rush the mixing. Let each chemical dissolve before adding the next one. Store the stock solution in a full, tightly capped bottle with a clear label.
Working Dilution and Use
Normal working dilution is 1+1.
A good starting point is:
- 1 part stock
- 1 part water
- 68°F to 70°F
- About 1.5 to 2 minutes
Use full development as your baseline. Do not use early snatching as the main contrast control. First control the print with exposure, paper grade, filtration, and developer dilution.
If the print is too cold or too hard, test slightly longer exposure and full tray development before changing the formula. If the print is too warm, too slow, or too flat, reduce bromide only in a controlled test batch.
Visual Characteristics
Expect warm black rather than obvious brown.
On the right paper, the tone can lean warm, olive-black, or soft black. The effect should be more visible on warm-tone papers and some chloride or chlorobromide papers. On modern neutral or cold-tone papers, the shift may be subtle.
This is a developer for controlled warmth, not a substitute for sepia toning.
Comparison to Related Formulas
Agfa/Ansco 135 sits in the same broad family as other MQ warm-tone paper developers. Compared with a more neutral general-purpose print developer, it has a more restrained character and should usually feel less cold and less aggressive.
Compared with a glycin-based paper developer such as 130, this formula is simpler and does not have the same glycin character. It should not be expected to give the same tray life, glow, or tonal latitude associated with glycin formulas.
Compared with a direct brown-tone formula or a sepia redevelopment process, 135 is much more subtle. It prepares a warm-black silver image. It does not convert the image into a brown sulfide image.
Safety Notes
Use gloves, eye protection, good ventilation, and careful dust control when mixing dry chemicals.
Metol can irritate skin and may cause sensitivity in some darkroom workers. Hydroquinone deserves extra care because it has stronger toxicological and environmental concerns than many common darkroom chemicals. Sodium carbonate is alkaline and can irritate eyes and skin. Sodium sulfite dust can irritate the eyes and respiratory system. Potassium bromide should be handled as a chemical, not casually as a harmless salt.
Label all containers. Do not use kitchen tools. Do not breathe chemical dust. Do not dump concentrated chemistry carelessly. Always consult the current SDS documents for the exact chemicals you purchase.
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