Funrise made some of their single-axle jets in a color-changing plastic. I do not have any examples in my collection but have seen some in online auctions. They were supposed to change color in warm and cold water. The packaging photos all show greenish jets that change to a yellowish color. Despite the photos on the packaging, the actual jets I’ve seen appear white in color, almost like glow-in-the-dark plastic. I’m not sure if this is due to a degradation of the color changing plastic or if they were originally this strange white color. To date, I’ve only seen 4-packs of the color changing jets and all packages were marked “1988.” The following jets are pictured on the back of the packaging (those marked with an asterisk I can confirm as being produced as color changers): A-4 Skyhawk* F-4 Phantom* F-10A Thunderbolt II F-14A Tomcat F-15 Eagle* F-16A Fighting Falcon F/A-18 Hornet F-19 Stealth* SR-71A Blackbird* MIG 21bis Fishbed* MIG 238N Flogger* TU-26 Backfire Bomber* ...