Cilj rada je, pozivajući se na relevantne primjere iz prakse, istaknuti izazove (tj. potencijalne probleme) s kojima se susreću osobe koje nad jednom bojom ili nad kombinacijom više boja žele registrirati pravo žiga u odnosu na određene proizvode ili usluge – bilo na području neke od država članica Europske unije, bilo na razini EU-a. Paralelno će se ukazati i na izazove s kojima se susreću osobe koje već registrirani kolorativni žig žele zaštititi od povreda. Pojasnit će se zašto je na razini Unije registrirano tek nekoliko žigova nad bojom per se, ali i zašto su (prema relevantnoj praksi) žigovi nad kombinacijom dvaju ili više boja „lakše oborivi“ nego žigovi nad bojom per se. Prikazat će se na koji je način, revizijom žigovnog prava EU-a iz 2015. godine, europski zakonodavac oživotvorio tumačenje Europskog suda iz predmeta Libertel prema kojem pravo žiga nad određenom bojom ne smije neopravdano zadirati u interese konkurenata nad dotičnom bojom te će se istaknuti u kojem bi smjeru ES trebao revidirati tumačenje iz predmeta Heidelberger koje se odnosi na prikazivanje kombinacija dviju ili više boja na jasan i precizan način.The aim of the paper is to highlight the challenges faced by entrepreneurs who want to register or to enforce a trademark over a single colour or over a combination of colours – either at national level in an EU member state or at the EU level. The paper explains why only a few trademarks over a single colour have been registered so far at the EU level, and why (according to relevant practice) trademarks over a combination of colours seem to be more vulnerable than the single - colour trademarks. As, according to revision of EU trademark law from 2015, product features (including colours) are to be deprived from trademark protection, whenever features in question: a) result from the nature of the goods, b) are necessary to obtain a technical result or c) provide substantial value to the goods, the author concludes that respective provision reflects the assertion stressed by ECJ in Libertel - i.e. trademark protection shall not be approved when it is expected to unduly interfere with the interests of competitors. The author concludes the paper by criticizing the interpretation provided by the ECJ in Heidelberger case, where the ECJ suggested how to represent a combination of colors in a clear and precise manner. Namely, the author believes that standards established by ECJ in Heidelberger case seem to be too burdensome – as they significantly complicate the trademark registration procedure, as well as the trademark enforcement procedure – thus, allowing competitors to act unfairly. Accordingly, the re-interpretation of standards established in Heidelberger case is suggested
