In a medium mixing bowl, add the cornstarch. If making multiple colors, divide the cornstarch into separate bowls.

Pour the dish soap over the cornstarch. Add any desired food coloring and glitter at this stage.

Stir the mixture with a spatula. It will look dry and crumbly at first. Add the cooking oil to prevent sticking and add a glossy shine.

Once it is too difficult to stir, dust your hands with cornstarch and knead the mixture by hand until it forms a smooth, stretchy dough.

If the dough is too sticky, knead in more cornstarch 1 tablespoon at a time. If it is too dry and crumbly, knead in a squirt of dish soap.

Store in an airtight container when not in use.