The blue colour comes from the silica and the way it reflects sunlight. During summer there can also be a hint of green in the water.
However, and this might come as a surprise to you, the water is actually white. If you pour it into a transparent cup, i
Fresh pic of this traditional piece done by artist Douglas Sparks aka @meanmugdoug at Empire Tattoo in Clementon, NJ ????⏱️
King of the jungle done by Matthew Doherty aka @dohertytattoos at Empire Tattoo in Clementon, NJ ????????
Half sleeve in progress by artist Douglas Sparks aka @meanmugdoug at Empire Tattoo in Clementon, NJ