Invert for first 30 seconds and then twice every 30 seconds.
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Rollei RPX 400 in Adox Adonal 1:50
21 minutes at 20°C/68.0°F
Kodak Tri-X 400 in Kodak HC-110 1:47
8 minutes at 20°C/68.0°F
Kodak Tri-X 400 at 1600 in Kodak HC-110 1:31
16 minutes at 20°C/68.0°F
Oriental Seagull 400 in Agfa Rodinal 1+25
7 minutes, 30 seconds at 20°C/68.0°F