I think the stamp will encourage the wrong behavior of scrubbing the spot where you got stamped.
My understanding is that it's not that you need to wash your hands for at least 20 seconds and you're good to go but rather that if you're truly washing your hands thoroughly it will take you at least 20 seconds to do. Most of the time people don't fully wash their hands but just their palms, there's also your thumbs, behind of your hand, in between fingers, etc. There are few videos floating around showcasing how to properly wash your hands with gloves and paint. Here's a one I found on YouTube https://www.youtube.com/watch?v=cbX0xwKORjk
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I think the stamp will encourage the wrong behavior of scrubbing the spot where you got stamped.
My understanding is that it's not that you need to wash your hands for at least 20 seconds and you're good to go but rather that if you're truly washing your hands thoroughly it will take you at least 20 seconds to do. Most of the time people don't fully wash their hands but just their palms, there's also your thumbs, behind of your hand, in between fingers, etc. There are few videos floating around showcasing how to properly wash your hands with gloves and paint. Here's a one I found on YouTube https://www.youtube.com/watch?v=cbX0xwKORjk
Fair point, we've actually been thinking along the same lines. What if the bottle just lit up for 20s? And had the proper steps on the label?