text: does anyone know what heroin looks like i found a brownish kind of powder like but not really powder substance in my sister jeans while i was going to wash them someone told me this could be heroin does anyone know. i used to do the stuff. im a recovering addict. i can tell you that the more pure stuff has a  brownish color to it. but it can by white also. my guess would be that it probably is. sorry to say. it can come as a powder or also more compressed or it can be sticky.. i hope this helps you and hopefully its not what you think its not a good thing to get on!!! also if you are really worried that it could be get a drug test kit.