Shang Ruyi immediately turned around to look, and Tushere, who had been kneeling behind her, hurried forward and took out a small porcelain bottle from his sleeve.
Yu Wenquan said, "This is—"
Shang Ruyi said, "Father Emperor, this is a potion made from some Stone Moss that the child found at the corner of Chengqian Hall."
"This, what use is it?"
"This can reveal bamboo vinegar."
"Oh?"
Shang Ruyi said, "To be clearer, Father Emperor can have someone bring some bamboo vinegar here; I'll demonstrate it to Father Emperor, and you will understand how I will reveal the bamboo vinegar on this garment."
Yu Wenquan immediately said, "Liu Yu, go fetch some."
Liu Yu hurried away and returned shortly with half a cup of bamboo vinegar, placing it in front of Yu Wenquan. The bamboo vinegar was pale yellow and translucent, slightly rippling in the cup.
Yu Wenquan said, "How will you do this?"
