Blood rain has red colored water droplets. There are various reasons behind this. Around Sahara Desert, brownish dust and sand carried by storms mix with water droplets in clouds, giving rain its brownish red color. In Kerala, red spores of algae called Trentepohlia Annulata got carried by wind and mixed with water droplets, causing blood rain. While, in Zamora, Haematococcus Pluvialis algae got caught in rainclouds, got stressed and produced a red pigment called astaxanthin, causing blood rain.
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