Poisons

PLEASE DO NOT MISUSE THIS LIST.
Writing that murder-mystery story is fine. Doing what that murder-mystery spells out is not. (And death by poison is painful)
(And I don't want to be blamed for murder)

A note: The time noted below (that is confirmed or has dose written) is how long before one dies after contacting the poison.

By consuming

Ethylene Glycol (Antifreeze & Hydraulic Brake Fluid)
Odourless, colourless, sweet-tasting.
Severe diarrhoea and vomiting, delirium, paranoia and hallucination. In later stages muscle cramps, major organ failures, sight loss, hearing loss.
24-72 hours [confirmation required]
Full details
Antidote : Thiamine, Ethanol or Fomepizole

Hydrogen Cyanide (Pesticide and Insecticide)
Almond-scented, colourless, bitter. [?]
Seizures, apnea and cardiac arrest. Cells are unable to use oxygen.
1-10 minutes [dose depending]
Full details
Antidote : Amyl nitrite, Sodium nitrite, Sodium thiosulfate, or Hydroxocobalamin

Hydrofluoric Acid
Unknown-scented, unknown-coloured, unknown-tasting.
Mild gastrointestinal effects, hypocalcemia. Throat closes up, vomiting, pains in mouth, throat and abdomen.
Unknown time [over 3 ounces at 6%- 8% concentration]
Full details
Antidote : Unknown. First aid is to dilute with milk or water.

By contacting

Hydrofluoric Acid
Unknown-scented, unknown-coloured, unknown-tasting. [Due to death of tasters.]
Severe burns. Tissue death, interferes with calcium metabolism and poisons the system, causing cardiac arrest. When in contact with skin, it might go unnoticed, as it ruins the nerves.
160 cm2 or 25 square inches
1 - 24 hours [dose depending]
Full details

By inhalation

Hydrocarbon
Chemical pneumonia
6 - 24 hours [confirmation needed]


Others:
List of extremely hazardous substances