Sodium metal itself is not colorful in aqueous solution. It reacts violently with water, producing a colorless solution of sodium hydroxide (NaOH) and hydrogen gas (H₂).

Here's the breakdown:

* Sodium (Na): A silvery-white metal.

* Aqueous Solution: A solution where water is the solvent.

* Reaction: Sodium reacts with water to form sodium hydroxide and hydrogen gas.

* Sodium Hydroxide (NaOH): A colorless, odorless, and highly caustic solid.

* Hydrogen Gas (H₂): A colorless, odorless, and flammable gas.

Therefore, the solution is colorless. The reaction itself produces heat and often causes the solution to boil, but the solution itself does not have any color.

Important Note: The reaction between sodium and water is highly exothermic and dangerous. It should only be performed under controlled conditions by experienced professionals.