TEST TUBE, of the type that are used for chemical and biological analysis, having an approximate shape of a cylinder or a truncated cone, comprising an opening in the upper region thereof for inserting substances, and formed from a single piece of a homogeneous material with a translucent color, composed of a mixture of a polymer from the family of metallocene polyolefins, that homogeneously contains a polypropylene-based Masterbach of a laser-sensitive additive that changes color to a different contrasting color, for example an approximately brown-black color, when exposed to the excitation of a laser marker.