Rollei Supergrain is a fine-grain, full-speed developer suitable for any black any white film- not just Rollei/Maco products. Based on (though not identical to) the classic Amaloco AM-74 formula, this developer can be diluted up to 1:15, enough to develop”20 to 60″ rolls of film, though this is based on chemistry volumes for stainless steel tanks, so Paterson users can expect about25 rolls of 35mm at this dilution.