I don't think it's white heroin because here there's both white and brown heroin available. In areas like Stockholm it's most common with the white heroin, in Malmö (where I live) and Copenhagen (where I've spent a lot of time) and the rest of the southern Sweden there's almost only the brown type available. Here we call white heroin "thaismack" and brown dope is just "heroin".
Sorry, that must be me being a bit mentally slow cuz I haven't been sleeping. Those mixtures might just be the heroin in my area. Usually the dope here is a mixture of all kinds of shit. Also I may have misunderstood their question, since they were presuming it was "cut" with something. I've edited my answer above (but left the original post intact) to make it more clear.
could be a lot of different sht..I was reading about a very large H bust in the city I live in (30lbs) and the tar was cut with shoe polish,coffee grounds, talkam powder.. Nasty SHIT... and powder lactose
Dope is typically cut with vitamin b, at least around here it is... and that's why we used to say my room smelled like dope. (We had left a bottle of vitamin b complex next to the vent in my room lol)