Readers of a certain age might remember Hypercolor or Hypergrafix clothing, the color-changing T-shirts produced by Generra that were all the rage in the early '90s. Now that the '90s are back, it ...

The shirts, designed for a class on wearable technologies, feature internal organs that change colors depending on the levels of carbon monoxide in the atmosphere (hat tip: NY Daily News).

In fact, in a brief three-month span, between February and May 1991, the company sold a whopping $50 million worth of color-changing, heat-sensitive T-shirts, shorts, pants, sweatshirts and tights ...

In the video, Bowker shows off T-shirts in a spectrum of pastels that were washed in London, in the Dead Sea, and in acid rain. Other water types will produce different effects: For example, pH 3. ...