I bleached 50/50 with water five different kinds of shells over night, rinsed and soaked in water for four hours this morning and dried for three hours in the window/sun. I used a Navy fine tip sharpie. (this is not mine). I will upload mine when I have a few more to show. Love love love!! So relaxing and peaceful to do this! However, the sharpie smell bothers me a little so will get a mask for the rest of them.