“Now a rainbow's tale isn't quite as nice as the story we knew of sugar and spice.”
There’s long been rumors as to how exactly rainbows are made in Equestria. While a great amount of Pegasi ponies are employed in the قوس قزح department of the weather factory, almost all of them do the low-end work. What’s known is that great streams of Spectra, the individual colors of the rainbow, flow through large grates and into vast vats. From there, workers carefully and equally mix the spectra into the coagulated قوس قزح pools that dot and run through the factory and surrounding city.