Apple Blog iMore confirms that people with Tattooed wrist will not be getting the best from the heart rate sensor.
People with Tattooed wrists are facing problems using the Heart Rate sensor which causes more problems as Heart Rate is used by Apple Watch to determine whether you are wearing it or not, which further causes inability to use Apple Pay, Placing call, receiving notifications or certain apps.
The issue stems from the way that the Apple Watch senses your heartbeat. According to Apple, the back of the Watch rapidly flashes green and infrared light at your skin, which gets absorbed or reflected by your red blood. When your heart beats, there is more blood in your wrist, and there is less blood between beats. By sensing the timing between your heartbeats, the Apple Watch can calculate your heart rate.
As it turns out, solid-colored tattoos — particularly red ones — also absorb the green light and reflect red light. Black tattoos, which absorb both green and red light, can also screw up the Apple Watch’s heart rate sensor.
The Apple Watch works fine with dark-colored skin, scars and skin abrasions, which are translucent, allowing light to pass through. Tattoo ink is opaque, preventing outside light from penetrating your skin.
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