Zhao summoned Mixing Assistant Fen and asked her about the extra jar number.
Yan stood beside the testing table while Fen looked at the folded card. She was young, with a thin scar across one eyebrow and dried alchemical dye on her cuffs. Her hands stayed close to her sides.
The wash court door had been left open behind her. A line of clean bowls hung on pegs there, and the smell of lye clung to her sleeves. Fen glanced toward it twice, as if the work she had left undone might call her back. Zhao set the card on the table between them. Wu stood near the cabinet where the first cup had been locked. Yan could see its pale ring through the glass panel.
“Tell me how the card came to be under that sleeve,” Zhao said.
“I wrote the second batch’s ingredients on it. I mixed the first dose on the same bench, and the card stuck beneath the wicker when I wiped the table.”
“You wiped around the cup?”
“I wiped the bench. I should have lifted the sleeve and checked underneath.” Fen pressed her thumb against the dye on her cuff. “I was trying to finish before the next batch arrived.”
Yan remembered the way the cup had tipped in his hand, the flake briefly shining at its bottom. He looked at Fen’s stained fingers. “Did you see the sediment before you mixed it?”
“I saw it in the spoon.”
“And you still used it?”
Fen looked at Zhao. “I thought it was binder. The recipe had begun to separate. I thought a little dry material would hold it together.”
Zhao examined the two pulse strips. The first dose had included the grey flake; the second had not. Yan had shown the same smooth circulation after both. The elder did not look at Yan as if he knew what that meant, but he kept studying the figures.
“The vessel’s storehouse entry,” he said. “Bring it to me.”
Wu opened the old inventory book. Dust gathered in the fold. The entry gave a jar number and described the contents only as old alchemical sediment. The space for a source was blank. There was no prior owner, no date of collection, and no note about use.
“Who logged it?” Zhao asked.
Wu checked the damaged page. “The name has worn away.”
“Could the jar have been open?”
“The cupboard seal was broken when the storehouse transferred it. There’s no record of who opened it.”
Zhao pressed the page flat. “This tells us nothing about the substance.”
Fen said, “I didn’t know it could change the dose.”
Yan looked at her. She seemed frightened, but not as if she were hiding a deliberate act. “Did you know it went into my cup?”
“I knew the batch was assigned to you. I didn’t know the sediment would be dangerous.”
Zhao turned to him. “The test produced no useful conclusion about the impurity. The second dose shows the result is not limited to that one cup.”
“Meaning the pulse changed both times.”
“Meaning the response is consistent.” The elder tapped the strips together. “You may have an unusual constitution. Or there may be another cause.”
He drew the day’s roster closer. “Between the two doses, what else did you take?”
Yan thought through the meals in order: millet in the morning, broth at midday, then the second cup. “Nothing but food and water. The broth was ordinary. It had cabbage and salt, no tonic herbs.”
“Who prepared it?”
“The kitchen crew. I don’t know which one ladled my portion.”
Wu checked the roster against the kitchen tally. “The broth went to the whole labor line. There’s no separate medicine ration recorded.”
Zhao ran a finger down the times. “And no other assigned dose?”
“No.” Yan kept his voice even. He could answer what had been placed in his hand. He did not have to invent certainty about every bowl or cup that had passed through the yard.
Fen shifted by the table. “Could the broth have had something in it?”
“There’s no evidence of that,” Zhao said. “We record what we know.” He turned the roster toward Yan. “You drank both assigned doses. The pressure rose, then ended. You report no lasting pain?”
“No lasting pain.” Yan could feel the smooth current whenever he drew a breath, but that was not an injury and not a fact he meant to explain here.
Yan did not know what a constitution would mean. “Will there be another test?”
“There may be.”
“Will I know what’s in it?”
Zhao did not answer at once. “The ingredients will be recorded.”
Fen watched Yan’s face. He could have blamed her and perhaps weakened Zhao’s interest in him. But the card and the old jar entry did not prove she understood what she had done. “I saw no sign she knew what the sediment was,” he said.
Fen let out a breath she had been holding. “Thank you.”
“I’m not saying it was harmless,” Yan said. “I’m saying I don’t know that you meant to hurt me.”
Zhao closed the inventory book. “We will not speculate. The laboratory will keep the cup and the card.”
Wu lifted the book carefully, supporting its brittle spine with both hands. A strip of old paper flaked from the fold and landed on the table. Fen reached for it, then stopped when Zhao raised two fingers.
“Leave it,” he said.
Wu slid a clean sheet under the loose edge. The old entry remained legible only in fragments: a jar number, the phrase old sediment, and a blank where its source should have been. Zhao leaned close enough to read it without touching the page.
“Can the storehouse find the vessel from this number?” Yan asked.
“They can confirm it was assigned to a cupboard,” Wu said. “They cannot tell us who collected it or when.”
“Then the number leads to an empty shelf?”
“It leads to a record,” Zhao said. “That is not the same as an answer.”
Yan nodded. He had hoped the old book might name an owner or a date. The damaged paper gave him neither. He could still remember the digits Fen had copied, but he kept his eyes on the line instead of reaching for it again.
Fen turned to Zhao. “Should I stop using every binder from that cupboard?”
“You should stop using any material without a current tag.”
“Even if it is listed as inert?”
“Especially if the listing has no source, date, or test.” Zhao’s tone stayed level, but Fen lowered her head. “Write what you used. Do not guess at what it did.”
“I will.”
Fen placed the folded card into a clear sleeve. She turned it over, then wrote the jar number on the outside. “The storehouse tag is here. If another vessel appears, this will identify the source cupboard.”
“Give me the number,” Yan said.
She copied it onto a separate strip and handed it to him. He checked the digits against the book before folding the note into his sleeve.
Zhao looked up. “Why do you want it?”
“So I know if it happens again.”
“The next assignment will remain inside Ashfall.”
Yan heard the limit in the order. Zhao wanted him close, where the pulse readings and sample box were easier to reach. He had no intention of leaving the yard tonight, but he did not like being told the size of his world.
The elder locked the mixing card in a cabinet beside the cup. Wu recorded the key handoff. Fen returned to her workbench with the old inventory number still on Yan’s paper.
At the door, she stopped. “I should have checked the jar.”
“Yes,” Yan said.
She looked at him, then nodded. “I’ll check every binder from now on.”
Zhao dismissed them. Yan went back to the yard. He had a number, not an explanation. Fen had used the sediment without knowing what it would do, and the second dose had worked without it. Whatever had changed his channels remained inside him, beyond the reach of the broken inventory.