article_snippet.sent: Tests suggest that tattoos in dark and solid colours interfere with the device the most.
article_snippet.sent: It is thought that  red and green inks reflect light in a similar way and the heart sensor can't distinguish between the blood and tattoo.
article_snippet.sent: Tests conducted by iMore suggest that tattoos in dark and solid colours interfere with the device the most.
article_snippet.sent: So the problem seems to occur when a wearer has something on their skin that reduces the lights reflectiveness, such as ink under the skin’s surface.
article_snippet.sent: However, ‘on tattooed sections, sensor readings varied wildly depending on colours and shading,’ Serenity Caldwell reported.
article_snippet.sent: Serenity Caldwell said  solid colours in darker inks such as black and red
article_snippet.sent: Tests on lighter colours such as purple and yellow caused slightly elevated misreadings of 80BPM, compared to 69BPM on the wearer’s non-tattooed wrist, but didn’t interfere with skin contact detection, unlike with darker shades of ink.
highlights_snippet.sent: Dark, solid tattoos seem to confuse the new device the most .
  