There is no such thing as “black light wavelength”—so why do black T-shirts, black crayons, and black marking pens look black? Investigate a variety of black ink markers ... Certain “permanent” inks ...

“I didn’t even believe it at first,” she says about the fading ink. “They explained how it worked, how it’s not permanent ... ink to join the classic black. They also hope to join ...

Unlike permanent tattoo inks, Ephemeral’s formulation is made to fade over 9–15 months. The company offers only black ink tattoos at a handful of brick-and-mortar studio locations across the ...

Radiation setup typically involves marking treatment areas with permanent black or blue tattoo ink to ensure correct alignment of the radiation machine over the weeks-long duration of treatment.

That is the motto of Ephemeral, a cosmetic company that developed a made-to-fade, semi-permanent tattoo ink in 2014. But some customers who were told their tattoos would disappear within 9-15 ...

Sealed bottles of tattoo and permanent makeup ink, including some marked as sterile, contained millions of potentially dangerous bacteria, according to new research by the US Food and Drug ...