Henna is never black! Often you read the news or listen to someone telling how bad is temporary tattoo and how skin in hands and legs developed rashes and blisters because of application of henna or mehendi or “black henna”.
How cool it would be to get a tattoo that is patient friendly? Well, researchers at MIT and Harvard joined the two concepts to create tattoos that can change color based on blood glucose level of the person wearing them.
If your tattoo artist has given any instruction follow that carefully.
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