VINTAGE 1991 Thermo Reactive Touch T-Shirt

VINTAGE 1991 Most Popular fashion item between 1991-1992! Thermo Reactive Touch T-Shirt. Similar to HYPER-COLOR. The gray parts turn into an aqua green color. The orange and purple are not thermo but the gray part inside the orange fingerprints turns aqua color. I provided side by side photos. It’s been in my moms attic since 1992. In great shape but I didn’t want to wash it again since the thermo reactive material could fade but not sure how it works. It’s a cool vintage piece. One tiny spot.