I cut off the branches from my barberry bush, trying to take parts that seemed to have a lot of color and the tiny berries. I chopped them all up into small pieces and simmered for an hour and let it sit overnight. After straining, the juice seemed to be fairly red, so again I hoped for red. The first samples with alum produced an light tan-orange color. Adding the tin turned the samples to olive green, then tan-green with copper and a very nice warm gray-browns with the iron and pre alum + iron.