Abstract: Disclosed is a device for absorbing and marking a potentially dangerous substance on the ground, the device including: an elongate hollow body, the inner walls of which define a storage space in which a powder is stored which is capable of absorbing the substance when the powder comes into contact with the substance, the storage space leading into an opening for pouring the powder onto the substance in order to neutralize the substance, a base on which the lower end of the body is directly or indirectly mounted, the base projecting laterally relative to the body so as to form a marker in order to position the device on the ground in a stable manner and to mark the presence of the absorbed substance on the ground.