Four inversions lasting 10 seconds at the start of each minute.
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Kodak Tri-X 400 in Kodak HC-110 1:47
6 minutes, 30 seconds at 20°C/68.0°F
Ilford HP5+ 400 in Spürsinn HCD-20 3. Generation 1+14
6 minutes, 45 seconds at 20°C/68.0°F
Kodak T-Max 400 in Ilford Microphen 1+1
10 minutes at 22°C/71.6°F