Chocolate Isn't a Vegetable?

Harry Potter Birthday Party inspired by Sweet & Simple ... "The Great Hall"  Honeydukes Candy Shop  Schoolsupplies (Pens taped to feathers from AC Moore, and notebooks with Hogwarts Crest).  Every wizard needs a sidekick...  Felt Flags with paper HP House Crests added to each.  Herbology (painting flowerpots and planting seeds)  Olivanders (easy diy wand tutorial here ) Platform 9 3/4

Whisk together 2 cups of baking soda, 1 cup of cornstarch, and 1 1/2 cups cold water in a sauce pan. Continue whisking slowly while heating the mixture on medium high. Remove from heat when mixture has the consistency of mashed potatoes. Cool, then knead on a counter dusted with cornstarch. Add more cornstarch as needed until the mixture is no longer sticky. Food coloring may be added (to make green penguins and such). Let dry for at least twenty-four hours before painting. *Work with small batches of dough at a time, storing the rest of the dough in an container covered loosely with a damp paper towel.