The method of manufacturing a ceramic core for a blade having a lower portion forming a core body, an upper portion forming a bathtub and a set of rods for holding the upper and lower portion integral, comprises:. a step of coating the rods with a material having a flash point below 1000 ° C; . a step of positioning the rods in a mold; . a step of molding the upper and lower parts by ceramic injection; . a step of firing the ceramic core.
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