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Doesn't matter what colour the flats are. But, grey works best.
You want to watch the exposure on the back of your camera's histogram.
You want it to peak somewhere between 1/3rd- to 1/2-way across the X-axis.
Use LiveView Exposure Simulation (if your camera has it) for working out exact shutter speed required. Or, just view the histogram as you take test shots.
H
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