Zhou Ning looked around and spoke faintly.
"Diphacinone is an anticoagulant rodenticide, a drug that acts slowly. These types of substances are lipophilic, which means they are ineffective in water because they are completely insoluble in it. First, they require fats, and second, a prolonged period of exposure to ensure continuous contact with Zhang Guanglei."
Mr. Zhao looked around furtively. The kitchen wasn't in use; it was impossible for the poison to be in the condiments and food. He had also checked every other item in the room but found nothing out of the ordinary.
Mr. Zhao became somewhat anxious, walking aimlessly around the room, considering there weren't many things in it that one could ingest.
"What about its color, smell, and taste? Is there anything distinctive about them?"
