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Help dissolve/reprecipitate silver during development → finer grain, smoother tones.
Potassium thiocyanate ( thiocyanide KSCN Potassium rhodanide ) 1000g 1kg
1 410,14 Kč
Net price: 1 146,46 Kč
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 1000g
188,03 Kč
Net price: 152,89 Kč
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 100g
70,52 Kč
Net price: 57,31 Kč
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 25 000g = 25kg bag
3 501,89 Kč
Net price: 2 847,05 Kč
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 5000g
822,58 Kč
Net price: 668,75 Kč
Sodium sulfite (sodium sulphite) Na2SO3 Natriumsulfit Hypo clear - 500g
117,51 Kč
Net price: 95,52 Kč
Urea ( carbamide , Carbonyl diamide ) - 1000g
117,51 Kč
Net price: 95,52 Kč
Urea ( carbamide , Carbonyl diamide ) - 100g
29,48 Kč
Net price: 24,00 Kč
Urea ( carbamide , Carbonyl diamide ) - 25 000g = 25kg bag
2 796,76 Kč
Net price: 2 273,76 Kč
Urea ( carbamide , Carbonyl diamide ) - 5000g
493,51 Kč
Net price: 401,24 Kč
Urea ( carbamide , Carbonyl diamide ) - 500g
70,52 Kč
Net price: 57,31 Kč
Ammonium thiocyanate (Ammonium rhodanate)Loba 98.5% AR/ACS Op.500 g
598,23 Kč
Net price: 486,38 Kč
Sodium rhodanate (sodium thiocyanate) 98% Loba AR Op.500 g
797,64 Kč
Net price: 648,47 Kč
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.