The reported study is the part of empirical project concerning Teodor Axentowicz’s signatures (it takes into consideration works created in different techniques). Teodor Axentowicz belongs to outstanding Polish painters. He was an excellent pastelist too. Depending on applied technique there is a large range features of Axentowicz’s signatures. It gives reasons for analyzing signatures created in different techniques separately. The results of the study may be used in practice. In public museums and private collection there are forged works attributed to Teodor Axentowicz. Authors determined the range of changeability of Teodor Axentowicz’s signature features (created by means of technique in pastel and not questioned origin). The outcome may be
used to verify authenticity a particular questioned masterpiece (signature expertise may be an element of complex scientific detection of forgery).