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May & Baker B&W Reversal Processing

First Developer    
Suprol 1 + 4  
add Sodium Thiocyanate 4 g/litre  
     
Bleach Bath    
Potassium Dichromate 50 g  
Sulphuric acid (conc) - see note 50 ml ADD THE SULPHURIC ACID DROP BY DROP TO 900ml OF WATERWITH CARE.
Water to 1 litre  
     
Use 1+9    
     
Clearing Bath    
Thiolim 1+ 9  
or    

Sodium Sulphite

50 g  
Water to 1 litre  
     
Second Developer    
Suprol 1+ 7  
     
Stop bath    
Acetic Acid 3% solution  
     
Fixer    
Amfix 1 + 3  
     
First Developer 20°C 12 minutes  
Wash 5 mins  
Reversal Bath 5 minutes  
Wash 1 minute running water  
Clearing Bath 2 minutes  
Wash 1 minutes  
Re-exposure

Expose to 100 watt bulb 18inches/0.46 metres for 30 - 60 seconds

 
Second Development 20°C 6 minutes  
Wash 30 scs running water  
Fixer 5 mins  
Wash 10 mins running water