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A comment on The Apple Watch does not play nicely with some tattoos. Parent comment

Re:The Apple Watch does not play nicely with some tattoos by draven on Wednesday April 29, 2015 @10:02AM (#9458281)
The section "The science behind Apple's sensors" in the article contains some details about that.

Quick google search returned this: https://en.wikipedia.org/wiki/Photoplethysmogram

According to this: http://bsn2014.org/poster/BSN2014-poster09s-maeda.pdf Green light seems to be used to lessen the impact of motion on the measurements.

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Re:The Apple Watch does not play nicely with some tattoos by conphill on Wednesday April 29, 2015 @10:41AM (#9458579)
Awesome resources. Thanks for providing this.
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