Agitate every 20-30 s.
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Rollei Rpx 100 at 400 in Rollei Supergrain 1+7
9 minutes, 30 seconds at 19°C/66.2°F
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11 minutes, 30 seconds at 20°C/68.0°F
Shanghai GP3 100 in 510 pyro 1+100
12 minutes, 30 seconds (Stand developed) at 20°C/68.0°F