Invisible design until you sweat

Graphics printed using the ViewSPORT\xae Ink are completely invisible until activated with water.
As the shirt becomes wet, the design begins to appear.
The more the person sweats, the clearer these graphics become.
Once the shirt begins to dry the images disappear, ready to start the cycle again.

Graphics printed using the ViewSPORT® Ink are completely invisible until activated with water. As the shirt becomes wet, the design begins to appear. The more the person sweats, the clearer these graphics become.

This is a list of 99% Invisible podcast episodes, hosted by Roman Mars.
From its inception in 2010 until April 2021, 99% Invisible was produced and distributed by Radiotopia.
In April 2021, the company that produces the show was acquired by SiriusXM, with 99% Invisible moving to the Stitcher Radio network.