Grown-up Reels on Instagram: "Follow @grownupreels ☠️ Fireworks get their colors from metal minerals burning at specific temperatures — but blue is the diva of the bunch. Copper makes blue light, yet it falls apart if things get too hot, which is why a deep, rich blue firework is basically the Olympic gymnastics routine of pyrotechnic chemistry: precise, rare, and wildly impressive when nailed. Humans have been tweaking these color recipes for over 1,000 years, turning ancient signal flares into