Tech Support Newsletter
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Apple has said some of the functions on its new smartwatch may not work properly when it is worn over tattoos.
Darker-coloured artwork and even changes in darker coloured skin types can fool the light sensors on the back of the watch.
The problem is not exclusive to the Apple Watch, which performed well in independent tests.
But it does show the manufacturer has not solved the sensor problem.
"Permanent or temporary changes to your skin, such as some tattoos, can... impact heart rate sensor performance," Apple said on a support page on its website.
"The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings."