Elixirs
You do not need Alchemy or Herbal Lore to consume or administer an Elixir. These are delivered in all ways like Potions. Note that any creature which is Immune to Poison will be Immune to any Elixir, as these are delivered with the Poison qualifier.
Elixirs can be mixed into food or drink to poison a character. Anyone with Herbal Lore may apply a single Elixir to a container by spending at least three seconds role-playing this action. Once applied, the pertinent tag must be attached to the food or drink container which has been poisoned and will stay until either (a) the poisoned item is first ingested, in which case the person imbibing the poisoned item will be affected by the elixir and the tag then removed; or (b) the first piece of poisoned food or drink is transferred from that container, in which case the tag should be moved with the poisoned food, leaving the rest of the container clean. You cannot use a single tag to affect multiple characters with Alchemy.