Hello, I am just about to create a river with Woodland scenics EZ water. What I want to know is, is there any way to add dye to EZ water ? When you look at most real rivers you cannot see the river bed. The water just looks dark. I think EZ water is transparent when it dries out. Is this correct ? Can I simply add a little dye to the liquid EZ water before it sets ? Thanks for any advice on this.