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ID-67 Ilford PQ Developer

Phenidone 0.25 g  
Sodium Sulphite (anh) 75 g  
Hydroquinone 8 g  
Sodium Carbonate (anh) 37.5 g  
Potassium Bromide 2 g  
Benzotriazole 1% soln 15 ml  
Water toWater to 1 litre  

To use: Films - Dilute 1+2 to 1+5

ID-67 can be made up as a more concentrated stock solution and keeps well with an excellent shelf life.

ID-2 is the earlier MQ version of this formula.

Concentrated Stock Solution ID-67

Phenidone 0.625 g 3.125 g  
Sodium Sulphite (anh) 187.5 g 625 g  
Hydroquinone 20 g 100 g  
Sodium Carbonate (anh) 93.8 g 468.75 g  
Potassium Bromide 5 g 25 g  
Benzotriazole 1% soln 37.5 ml 187.5 ml (or 1.88g)  
Water to 1 litre 5 litres  

To use: Films - Dilute 1+5 to 1+14