Ohio Rev. Code § 907.44: Exceptions.

No person shall sell, distribute, or have in his possession for sale any seed or grain which has been treated with a poisonous material unless the seed or grain has been colored or dyed a color contrasting with its natural color. Seed or grain to which a material has been applied for the express purpose of killing or mitigating insects, fungi, or other forms of plant or animal life present in the grain, and which bears no residue of a poisonous material for which a tolerance has not been established, or which bears no residue in excess of a tolerance recognized in regulations adopted under authority of sections 907.41 to 907.47, inclusive, of the Revised Code, and in accordance with sections 119.01 to 119.13, inclusive, of the Revised Code, are exempted from the coloring and labeling requirements of sections 907.41 to 907.47, inclusive, of the Revised Code.