W665 is an Ultra Fine Grain type developer based on Ortho- Phenylene Diamine....
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Foma Fomapan T 200 at 160 in Foma Fomadon R09 1+50
9 minutes at 20°C/68.0°F
Foma Fomapan 200 in Agfa Rodinal 1+50
8 minutes at 20°C/68.0°F
Rollei Rpx 400 in Agfa R09 One Shot 1:25
9 minutes at 20°C/68.0°F