19 CFR § 10.452 - Exclusions.
§ 10.452 Exclusions.
A good will not be considered to be an originating good and a material will not be considered to be an originating material by virtue of having undergone:
(a) Simple combining or packaging operations; or
(b) Mere dilution with water or with another substance that does not materially alter the characteristics of the good or material.