Video shows Agnikul engine forming Mach diamonds in hot-fire test

A video shared by Chennai-based startup Agnikul Cosmos showed its Agnite engine forming Mach diamonds during a hot-fire test. Mach diamonds are bright, repeating diamond-shaped patterns that appear in the supersonic exhaust plume of a rocket or jet engine. Agnite is a 3D-printed, semi-cryogenic booster-stage engine that stands one metre tall.