As of January 1, 2011, a person shall not sell or offer to sell in this State any engine coolant or antifreeze that contains more than 10 percent ethylene glycol unless the engine coolant or antifreeze includes denatonium benzoate at a minimum of 30 parts per million and a maximum of 50 parts per million as an aversive agent within the product so as to render it unpalatable, except that this subchapter shall not apply to product inventory purchased by retailers prior to January 1, 2011. (Added 2009, No. 15, § 2, eff. May 12, 2009.)