Connecting a product to a geographical region can help in augmenting a products value in leading to creation of a protected brand. EU awards the term „protected geographical indication“ (PGI) to products of well defined geographical origin, e.g. agricultural products, and/or distinct processing. The concomitant raise of value, nevertheless, gives rise to forgery in terms of the products origin. Therefore, chemical analytical methods have been established to prove the origin of wine but, hitherto, no established set of chemical analytical methods is known for pumpkinseed oil. During this diploma thesis, three different analytical methods were investigated for their suitability to distinguish between Styrian samples and samples from outside the PGI-area. As a result, a combination of methods for reliable proof of geographical indication is suggested and verified by statistical methods. A second part of the thesis attempts to suggest methods for introducing the field of forensic chemistry to students from 15 to 19 years. One of the methods of part 1, i.e. stable isotope analysis, helped to investigate a pipe bomb murder in Austria in the 1990s. The teachers material, designed in part 2, should provide an introduction to the astonishing amount of information that can be gained from determination of isotope ratios.