Lime Powder

TL1; Free to $1/dose. LC3.
Powdered quicklime (see Mortars and Mineral Adhesives, LT19) can be used as a respiratory agent or a blood agent (mainly against the eyes).

• As a respiratory agent, it has a one-second delay and a HT roll to resist. It causes immediate coughing or sneezing (p. B428); if not resisted, it deals 1 point of toxic damage, repeating at one-second intervals for 10 seconds.
• As a blood agent, it has no delay but allows a HT roll to resist. If not resisted, it causes severe pain (p. B428) – and, if in the eyes, blindness.
  Both conditions last until the location is flushed with water for 5 minutes. Lime powder loses potency in days unless kept dry, which calls for a sealed container.

Source: GURPS 4th - Low-Tech, page 132