there is provided a laser - writable molding material containing a ) at least one polymer material or at least one precursor compound which can be polymerised to give a polymer material , and b ) a particulate salt - like compound or a mixture of particulate salt - like compounds , which under the influence of laser light changes its color or leads to a color change in the component a ). in order to enlarge the range of matrix materials hitherto available for laser writing and to overcome the disadvantages of the previously used writing procedures for such matrix materials , the laser - writable molding material according to the invention is characterised in that the at least one polymer material of the component a ) is selected from polymer compounds having siloxane crosslinking units .