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Help dissolve/reprecipitate silver during development → finer grain, smoother tones.
Potassium thiocyanate ( thiocyanide KSCN Potassium rhodanide ) 1000g 1kg
Availability: Large quantity
Dispatched within: 5 days
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 1000g
Availability: Large quantity
Dispatched within: 5 days
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 100g
Availability: Large quantity
Dispatched within: 5 days
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 25 000g = 25kg bag
Availability: Large quantity
Dispatched within: 5 days
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 5000g
Availability: Large quantity
Dispatched within: 5 days
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 500g
Availability: Large quantity
Dispatched within: 5 days
Urea ( carbamide , Carbonyl diamide ) - 1000g
Availability: Large quantity
Dispatched within: 5 days
Urea ( carbamide , Carbonyl diamide ) - 25 000g = 25kg bag
Availability: Large quantity
Dispatched within: 5 days
Urea ( carbamide , Carbonyl diamide ) - 5000g
Availability: Large quantity
Dispatched within: 5 days
These influence grain appearance by partially dissolving silver as it forms and letting it redeposit more smoothly. This tends to produce finer, less “peppery” grain and smoother midtones. The tradeoff is that strong solvent action can slightly soften edge sharpness (acutance) and reduce the crisp “bite” some people like.
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Sodium sulfite at higher levels gives classic fine-grain behavior (e.g., D-76 style).
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Thiocyanates are stronger solvents: they can boost speed and smooth grain further, but overuse can make grain “clumpy” or reduce apparent sharpness.