For overexposed or fogged film

Solution A
Water	300 ml
Potassium Ferricyanide	40 g
Water to make	500 ml
Solution B
Water	1L
Sodium Thiosulphate (Hypo)	450 g
Water to make	2 L

Mixing instructions: Add chemicals in specified sequence.

Dilution: to 1L of water add 30 ml of Solution A and 30 ml of Solution B.

Use: Pour solution into a white tray and immerse a wet negative. Agitate gently. Watch the action carefully and remove the negative as soon as the desired density is achieved. Immerse immediately into running water to stop the action. Wash thoroughly. The mixed solution has a short life, but the process can be repeated with fresh solution for further effect. To slow down the action increase the proportion of water in the working solution.

For overdeveloped negatives

Solution A
Water	750 ml
Potassium Ferricyanide	8 g
Water to make	1 L
Solution B
Water	600 ml
Sodium Thiosulphate (Hypo)	200 g
Water to make	1 L

Mixing instructions: Add chemicals in specified sequence.

Use: Immerse a wet negative in Solution A for 1 - 4 mins depending on the degree of reduction required, then treat in Solution B for 5 mins and wash as normal.