Preheat the oven to 225 degrees
In a standing mixer, add in the egg whites and cream of tartar.
Mix on medium speed until soft peaks form and then increase to faster speed.
Alternating between the sugar and powder sugar, add in 1 Tablespoon at a time until stiff peaks form.
Add in the vanilla and mix until combined.
Split batter into 5 bowls
Add blue into one bowl
Add pink into the second one
Add orange into the third one
Add yellow into the fourth one
Leave the fifth bowl white
Using a pastry bag with a round tip, scope some blue meringue on 1/4 of the bag
Add the pink meringue to another 1/4 of the bag
Add the orange to the bag
Add the yellow and then the white
Pipe on the meringues onto a baking sheet lined with parchment paper.
Bake for 90 minutes