Not in every developer, but show up in some modern ones.
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Not universal, but common in modern liquid concentrates.
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Surfactants reduce surface tension so the developer wets the emulsion evenly, helping to prevent tiny air-bell marks or uneven development, especially in rotary or tray processing.
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Biocides/antifungals stop microbial growth in stored concentrates (important for low-sulfite or ascorbate developers).
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Anti-stain additives may be included to keep the developer clear and reduce colored oxidation byproducts that could stain film or paper.