I'm very new to this. I am using Wilton colors (I didn't know any better). I am doing black accents on white frosting. I've done a test cookie and there is no bleeding yet (5 hours), how long until I am out of the woods? Am I ever out of the woods? This order is due Sunday and I think the cookies will be eaten either Monday or Tuesday. I'm just worried I'm going to deliver great looking cookies on Sunday only to have them be a mess by Tuesday!