Since I don't own a white board, I just pulled out some colored chalk and used that. We have two blackboards in our primary room. One is stationary at the front of the room, and the other is movable with a bulletin-type board on the other side.
I got there early so I could write the song on BOTH boards. One for Senior and the other for Junior Primaries. There wouldn't be enough time in between to re-write the song on the board again.
This picture is just to show how to write the song - with different colors. ('course I wrote the words to "I Belong....") The Primary Singing Ideas Website will give you step-by-step directions.....
The kids just LOVED the fizzy-white-powder-in-the-water-that-turned-color-like-magic idea! It was just so much fun. Even the teachers and leaders were stumped! They all came up afterwards and asked, "How did you DO that?" Awesome. You've gotta try this. Click on the URL above, and see what I'm talking about.