Selectol-Soft

Selectol-Soft (Ansco 120 variant) is the canonical "soft" pure-glycin paper developer — the developer most commonly paired with Ansco 130 in the two-tray printing workflow that defined West Coast B&W fine printing through the late 20th century. Where Ansco 130 combines glycin with Metol+Hydroquinone for moderate contrast and warm tone, Selectol-Soft uses glycin alone (no Metol, no Hydroquinone) to produce lower contrast and warmer tones than Ansco 130.^[1]

Selectol-Soft's signature operational property is shadow detail recovery — at standard 1:1 working dilution, Selectol-Soft develops shadows openly while compressing highlight density. Used as a single-tray developer, it produces prints that lack contrast punch but preserve full shadow rendering. Used as the first tray in a two-tray sequence with Ansco 130 (or with Dektol), it provides the shadow opening, then Ansco 130 (or Dektol) provides the highlight contrast — the combination yields a print with both shadow detail and contrast that neither developer produces alone.

The developer is named after the discontinued Kodak Selectol product family — Kodak's Selectol-Soft was the most widely-used commercial product through the 1970s-90s. Kodak discontinued the Selectol family in the early 2000s; current Selectol-Soft workflows mix from individual chemicals using the published Ansco 120 formula.

Selectol-Soft is mixed from individual chemicals to one liter of stock, then diluted 1:1 for working solution.

When to choose Selectol-Soft

Selectol-Soft sits in a specific compositional niche — the "shadow opening" partner for two-tray printing workflows:

• vs Ansco 130 (single-tray): Ansco 130 alone produces moderate contrast with warm tone. Selectol-Soft alone produces low contrast with very warm tone. Choose Ansco 130 single-tray for routine warm-tone printing; Selectol-Soft + Ansco 130 two-tray when you need both shadow detail and warm-tone contrast.
• vs Dektol single-tray: Same comparison — Dektol gives clean cool-neutral contrast, Selectol-Soft + Dektol two-tray gives shadow detail + clean contrast.
• vs Selectol (without "Soft"): Original Selectol is a slightly higher-contrast version of Selectol-Soft. Choose Selectol-Soft for maximum shadow opening; Selectol when you want the glycin warmth without the dramatic contrast reduction.
• vs Single-tray printing in any developer: Two-tray printing with Selectol-Soft + a "punch" developer is more work than single-tray, but produces qualitatively different prints. Reserve for portfolio-quality work where the additional darkroom time pays back.

The pure-glycin chemistry

Selectol-Soft's chemistry is glycin-only:^[2]

• Glycin (N-(4-hydroxyphenyl)glycine) — the sole developing agent at moderate concentration; produces the warm-tone shift through its silver-grain interaction (same mechanism as in Ansco 130 but undiluted by other developing agents)
• Sodium sulfite (high concentration) — preservative + mild alkali + provides solvent action that contributes to fine-grain rendering
• Sodium carbonate (moderate concentration) — alkali activator at lower concentration than Dektol, giving slower development and gentler tonal compression

The absence of Metol and Hydroquinone is what produces the soft contrast — those are the high-contrast workhorses of MQ developers. Without them, glycin alone develops gradually and never reaches the high-density-region punch that Hydroquinone provides. The result: a print with full shadow rendering but compressed highlight density, exactly the character that pairs well with a "punch" developer in the second tray.

Two-tray workflow with Selectol-Soft + Ansco 130

The classic two-tray sequence:

1. Tray 1 (Selectol-Soft, 1:1 working solution at 20°C): Develop print 60-90 seconds — long enough to bring shadow detail up but not long enough to develop highlight contrast. Print should look "flat" with open shadows and weak highlights at this stage.
2. Tray 2 (Ansco 130 or Dektol, standard working solution): Transfer print directly (no rinsing — carry-over of Selectol-Soft is part of the workflow), develop 30-60 seconds to add highlight contrast and complete the print.
3. Standard stop bath, fix, wash sequence as for any print.

The exact tray-1-to-tray-2 timing ratio is the printer's primary control variable: more time in tray 1 = more shadow detail, less highlight contrast in the final print; less time in tray 1 = less shadow opening, more contrast from tray 2.

Practical notes

• Mix from individual chemicals — no commercial pre-mix product. Glycin is moderately expensive but not prohibitive.
• Mix order matters: dissolve sodium sulfite first, then sodium carbonate, then glycin last (glycin requires the alkaline environment to dissolve fully).
• Stock keeps 6+ months in tightly-sealed full bottles; partial bottles oxidize within ~3 months.
• Working solution 1:1 keeps 1-2 hours in a covered tray — comparable to Dektol but shorter than Ansco 130. Mix fresh per session.
• Tray temperature 20°C — like other glycin developers, Selectol-Soft is moderately temperature-sensitive.
• Two-tray workflow requires consistent timing — use a darkroom timer; the technique only works if tray-1 vs tray-2 ratios are reproducible across prints.
• PPE: nitrile gloves and eye protection. Glycin is a known sensitizer.

Related recipes

• [[recipe-ansco-130|Ansco 130]] — the canonical two-tray pairing partner; the warm-tone "punch" developer
• [[recipe-dektol-d-72|Dektol (D-72)]] — alternative two-tray pairing partner; cooler-neutral "punch"
• [[recipe-selectol|Selectol]] — slightly higher-contrast Selectol variant
• [[recipe-amidol-paper-dev|Amidol Paper Developer]] — alternative warm-neutral single-tray developer
• [[recipe-ethol-lpd|Ethol LPD]] — modern long-tray-life alternative; less contrast than Ansco 130, more than Selectol-Soft