diff --git a/grinder.lua b/grinder.lua
index 4693677..a794e66 100644
--- a/grinder.lua
+++ b/grinder.lua
@@ -247,7 +247,7 @@ local function register_dust(name,input_node_name,ingot,grindcost,cooktime,R,G,B
 		local purity = purity_table[i];
 		minetest.register_craftitem("basic_machines:"..name.."_dust_".. purity, {
 			description = name.. " dust purity " .. purity .. "%" ,
-			inventory_image = "basic_machines_dust.png^[colorize:#"..R..G..B..":180",
+			inventory_image = "basic_machines_dust.png^[colorize:#"..R..G..B..":"..purity * 2,
 		})
 	end
 	
diff --git a/textures/basic_machines_dust.png b/textures/basic_machines_dust.png
index efa2dbe..59fa24b 100644
Binary files a/textures/basic_machines_dust.png and b/textures/basic_machines_dust.png differ