Some of this article is speculation. However, I believe the facts as circumstantial as they are support the canonical facts.
  • First, it is known from Data that quadratanium is no more suspicious for his life-form than an antiseptic or an ointment is for humans. Some antiseptics and ointments, if ingested orally, can cause harm to people.
  • Secondly, Lore's movements. After his appearance at the ship's stores, he returned to Data's quarters.
  • Thirdly, and lastly, Lore used a substance which appeared as fine dust. Natasha Yar described the quadratanium as "finely grind".

Combining these three facts, I believe the substance which poisoned Data is quadratanium. Airtram3

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