Combine baking soda, cornstarch, citric acid, and granulated sugar in a food processor.

Pulse the mixture until well combined.

With the processor running, slowly drizzle almond oil and olive oil through the feed tube.

Process until the oils are thoroughly blended.

Add food coloring to the mixture.

Add just enough water to create a crumbly mass, resembling damp sand.

Transfer the mixture to ice cube trays.

Press the mixture firmly into each cube mold.

Place the filled ice cube trays in a cool, dry place.

Allow the cubes to dry and harden overnight (approximately 12 hours).

Carefully remove the dried cubes from the tray.

Ensure the cubes feel dry and hard before packaging.

Package the finished bath cubes into a glass jar for storage.