An acidic bath that immediately halts development.
Anhydrous Citric Acid - 1000g
€9.32
Net price: €7.58
Anhydrous Citric Acid - 100g
€2.37
Net price: €1.92
Anhydrous Citric Acid - 25 000g = 25kg bag
€139.78
Net price: €113.65
Anhydrous Citric Acid - 5000g
€37.28
Net price: €30.31
Anhydrous Citric Acid - 500g
€5.59
Net price: €4.55
Citric Acid Monohydrate - 1000g
€8.29
Net price: €6.74
Citric Acid Monohydrate - 100g
€1.94
Net price: €1.57
Citric Acid Monohydrate - 5000g
€36.34
Net price: €29.55
Citric Acid Monohydrate - 500g
€4.66
Net price: €3.79
Sodium Pyrosulfite ( metabisulfite ) metabisulphite Na2S2O5 - 1000g
€4.19
Net price: €3.41
Sodium Pyrosulfite ( metabisulfite ) metabisulphite Na2S2O5 - 100g
€1.29
Net price: €1.05
Sodium Pyrosulfite ( metabisulfite ) metabisulphite Na2S2O5 - 25 000g = 25kg bag
€70.73
Net price: €57.50
Sodium Pyrosulfite ( metabisulfite ) metabisulphite Na2S2O5 - 5000g
€16.77
Net price: €13.64
Sodium Pyrosulfite ( metabisulfite ) metabisulphite Na2S2O5 - 500g
€2.80
Net price: €2.27
Citric acid anhydrous 99,5% Loba AR Op.500 g
€18.03
Net price: €14.66
PureLand citric acid chda 1 hydrate op.100g HDPE bottle
€2.18
Net price: €1.77
PureLand citric acid chda 1 hydrate op.1kg HDPE bottle
€12.44
Net price: €10.11
PureLand citric acid chda 1 hydrate op.500g HDPE bottle
€7.55
Net price: €6.14
Development doesn’t stop on its own — developer left in the emulsion keeps working and can overdevelop highlights. A stop bath (usually weak acetic or citric acid) rapidly neutralizes the alkaline developer, freezing the tonal state at the intended point. This gives more consistent contrast and protects the fixer from being exhausted by carried-over developer. Water can be used as a stop in a pinch, but acid stops are faster and more reliable.