There are other admittable colours, but they are frowned upon and thus not common. Currently the standard rules that such “faulty coloured” dog’s exterior cannot be graded better than “good” at shows – no “very good”, “excellent”, CAC, BOB etc. there, but this does not affect working titles. Those unwanted colours are: a little bit of white – not more than 1/3 anyway, so that at a glance the dog really does look solid-coloured; this areas are often ticked, and in heavily ticked individuals white is apparent only on paws – the dogs with those little spots on fingertips are not discriminated against in the show ring. And then there are two variants of yellow - the breeders generally don't care which is which, although it is important - they have different modes of inheritance; the recessive yellow (e e) can be recognized by being free from any black hairs, and dominant yellow (ay-) often comes with dark carboneé areas on the back or even a dark mask (ay- em-). And also some of the black-and-tans are more lightly coloured than some dominant yellows, which can be to such a degree darkened that they can be termed “green”. These darker yellow dogs are also not discriminated against... Interestingly, among the related breeds, the recessive yellow appears in Istrian and Posavac hounds, and dominant yellow in Styrian hounds. Although it is generally believed that one of the constituents Peitinger used for the Styrian breed was solid-coloured variant (today not recognized by the standard as such, but recessive yellow baraks match this category) of Istrian wirehair hound, also called “barbino”, that are today usually unregistered - it is documented that it was a “wirehair breed from the south”, this could point to the fact that those were possibly Bosnian dogs; at that time, though, the difference between Istrian wirehair hound and Bosnian Barak was not all that clear. Today is for instance impossible to determine for certain, reading the catalogue descriptions, which breed were some of the early exhibited dogs from the beginning of the XX century, either Baraks or Istrian wirehair breed...
(This is as good place as any to mention that wire-haired Istrian is in no way only wirehair form of shorthair Istrian, but that those are two each well determined breeds that are quite by chance (or perhaps as a result of fashion, or taste) of the same colouring. Althought the occasional cross-breedings here can't be ruled out completely, the constitution (conformation) of the wirehair Istrian is nearly equal to Barak, but quite different from shorhaired namesake, which is smaller, finer built, and rather better suited for different, rockier terrain and warmer climate.) Wirehair Istrians in their own turn were crossed with Italian Spinone to improve that breed (Beckman 1889).
One of the reasons that dogs in these countries were always uniformly coloured is the tradition (from ancient Greece, even! says the legend)... But the more realistic is the turbulent history of Bosnia. Because many wars resulted in number of stray dogs, and game reserves are patched into small areas, it was necessary to cull these strays not only to protect game animals, but also, in fact more important, to prevent the spreading of rabies. Thus the hunters had to be able to recognize a hunting or pastoral dog at a quick glance, and multicoloured hounds, by their natural style working far away from their masters, were easily mistaken for strays. The policy was usually “shoot first, find owner later”... even if the dog was not harrasing livestock or doing any damage. As, in 1970 a black champion Giant Schnauzer was shot in the park adjacent (not part, just next close) to the hunting grounds in the outskirts of Zagreb, the very capital of Croatia, and the excuse to the hawkeye was that it seemed to be a wolf (!) although there was no question of wolves being closer than 100 km from the city at that time. Thus, most popular hunting breeds are the chocolate German pointer, or the easily recognizable plumed spaniels and setters; the hounds are mostly yellow/white, and terriers are mostly German jagdterrier (which many hunters, who should really know better, mix up with Baraks, even at close range view!). Pastoral dogs too, the most popular Croatian sheepdog and Sarplaninac, are uniformly coloured so that can be easily recognized – one is black, the other gray. Another pastoral breed, Tornjak, that is now (re)gaining popularity, is broken-coloured - and that might be one of the factors that made it nearly extinct, it was pulled off the brink at the very last moment.
If in the future Baraks become more popular with hunters in other countries or in non-hunting circles, it is likely that other colours, recessive, that spring from time to time but are generally very rare, might become established. I myself like dogs with some white, and I have seen very attractive yellow-white dogs, (ee factor), the colour of posavac, which colour-cum-wiry-hair would be accepted as a breed of it's own if there were only enough of them, as it was one of the first to be described in literature (by Laska in 1905). As it is now they are tucked in with this other closely similar breed, but therefore without due recognition. The very pale e e dogs that spring up in the F2 and subsequent generations from crosses of these wirehair posavac with genuine baraks are not all that handsome, they look more like the colour of washed-out rugs. I have also seen dogs with large white areas, some were nice silvery white phenotipically alike the Dalmatian but splattered with typical barak slate-gray, those are though usually considered to be miscoloured Istrian hounds; and I have seen very attractive brown (bb) with bright orange tan areas, that looked like a coat of flame (I admit I don't know if this is acceptable - it was off the show ring). This may be a throwback, because one Franz Laska who first described the breed also mentioned that the colour of “dry leaves” was common. I suspect, but cant't argue with absolute certainity that this is indeed a bb brown; brown colored mix-breeds that I've seen did not have the same brilliance of color. He warned, however, that the pure (glossy) chocolate is typical for bird dogs, not hounds.