If you’re using the loo in a public place, which side up do you put your hands underneath the soap dispenser? The lighter your skin, the less likely you are to automatically know the answer: or even to understand the question.
But the darker your skin, the more likely it is that you’ll know that the only way to get it to work is to make sure that the palms of your hands, which are lighter, are facing upwards at the sensor.
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