Yes , there is some Mexican Brown Powder heroin although it is available in smaller amounts than tar, mexican brown powder has been around since the 50's and is not made from or like tar. Also on the east coast, and in Detroit and chicago,and in Memphis where I live there is some dark brown powder that is fire,and is not tar, some of the Colombian heroin is brown, most is off-white though, depends on the producers in Colombia and what chemicals they use to "wash" the heroin or not to make it whiter or some leave it dark brown, some dope is light brown,etc..