News, information, issues, discussions, solutions. News, information, issues, discussions, solutions.Sometimes all the beans in some bags of coffee I have will be shiny. In other types of coffee, all the beans will be matte. What causes this and what, if anything, can it tell me about what I can expect from the coffee? : Coffee Posted byadminSep 19, 2013(+28/-2) submitted 2 hours ago by oneeyedgoat41[F]via Sometimes all the beans in some bags of coffee I have will be shiny. In other types of coffee, all the beans will be matte. What causes this and what, if anything, can it tell me about what I can expect from the coffee? : Coffee.