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lotuseaters

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  1. <p>You might want to try using a little Potassium Bromide (KBr) as your film's faster than 100 ISO. 0.7g to the litre will do. I think iodine salt will do the trick too, but I have never tried it myself. That said, a lot depends on your developing time. 15mins would be a good starting point for 200 ISO film.</p>
  2. <p>Caffenol-CM is for medium speed films, which explains why your Retro came out fine (provided it was a Rollei Retro 100) and your HP5 didn't, as latter is a 400 ISO speed film. You'll need to add a gram of potassium bromide to your recipe in order to develop 400 ISO and above.</p>
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