Colo. Const. art. IV, § 12

Governor may veto items in appropriation bills - reconsideration. The governor shall have power to disapprove of any item or items of any bill making appropriations of money, embracing distinct items, and the part or parts of the bill approved shall be law, and the item or items disapproved shall be void, unless enacted in manner following: If the general assembly be in session, he shall transmit to the house in which the bill originated a copy of the item or items thereof disapproved, together with his objections thereto, and the items objected to shall be separately reconsidered, and each item shall then take the same course as is prescribed for the passage of bills over the executive veto.