Fill each well of a muffin tin or small cup halfway with water.

Add 1–2 drops of food coloring to each cup. For pastel shades, use fewer drops; for vibrant colors, add more.

Stir each color mixture gently to combine.

Insert a toothpick into the top of a marshmallow.

Dip the marshmallow into the colored water as desired—halfway, fully, or at an angle. Hold for about 5 seconds.

Gently shake off excess dye.

Place the marshmallow upright into a Styrofoam block or an empty egg carton to dry.

Once dry, you can dip the other side for a two-toned effect, if desired.

Allow marshmallows to dry completely before serving or packaging.