The state milk board^* or its agent is authorized to condemn any illegal manufactured dairy product as defined in section 196.545, which is offered, exposed for sale, or sold for human food purposes, and shall identify same as an unlawful product. It shall be unlawful to remove or deface any identification placed upon the container of a condemned milk supply or upon a condemned product. A harmless food coloring may be used to identify a supply of illegal milk.