Decanting

Decanting is the method of combining partially full potions of the same kind. Potions may be decanted into any number of doses. For example, combining a 3 dose potion with a 1 dose potion will leave the player with a 4 dose potion and an empty vial, while combining a 1 dose potion with a 2 dose potion will create a 3 dose potion.

Occasionally it is required or recommended for potions to be in fewer doses rather than four:

• Barbarian mix potions can only be made from 2-dose potions.
• Not taking excess doses can reduce unnecessary monetary loss:
  • In the Wilderness, where player killers may interrupt killing a boss – taking a 2-dose super combat potion instead of 4-dose when the player only plans to kill a few bosses per trip, for example
  • At Vorkath, players typically only need two doses of super antifire per trip, and using a 2-dose potion allows an extra item of loot to be collected
  • At Chambers of Xeric, if the raid is already scouted, players may know how many doses of a stat-boosting potion are enough before a potion drop is received
• When drinking potions at a bank before going to an extended activity to save inventory space ("pre-potting"), or when training some skills, 1-dose potions may be convenient
• When making potions with stackable secondaries (like stamina potions), decanting the base potion to less than 4 doses may be convenient to activate the effect of the Amulet of chemistry (or Alchemist's amulet), allowing the player to get extra doses

Players can create 2-dose potions either by decanting two 1-dose potions, decanting two 3-dose potions, or decanting a 4-dose potion with an empty vial.

Two NPCs decant potions for players: Zahur in Nardah and Bob Barter at the Grand Exchange. They decant potions for free, but will charge 5 coins per missing vial if the player does not have enough vials to hold the decanted potions. The player may decant any potions (noted or unnoted) into any dose. Although Bob Barter is available in free-to-play worlds, his decanting option is only available for members.

Murky Matt at the Grand Exchange has a decant option that is used to combine used enchanted jewellery.

The Mastering Mixology minigame has a number of Herblore-related rewards, including two that can help with decanting, directly from the bank:

If potion storage has been unlocked as a reward from Mastering Mixology, it can be used as the fastest method of decanting potions in bulk - it stores potions as individual doses, and they can be withdrawn at any dosage. To decant, deposit potions into potion storage then select the desired potion icon to set the dosage which gets withdrawn. If decanting potions to lower dosages, adding empty vials to the potion storage may be necessary.

The chugging barrel, also from Mastering Mixology, can be used to decant potions into 4 doses by depositing any dosage into the barrel, then withdrawing them again. It can be bought off the Grand Exchange for a price of 9,061,969. For a convenient method of decanting directly from the bank, potion storage is likely to be preferred, as it takes fewer actions and can decant to any dose; obtaining it also requires significantly less herbs and time spent in Mastering Mixology, an advantage for restricted accounts like Ironmen.

• Previously, NPCs could only decant potions into 4-dose potions. The option to select other dose sets was added in an update on 27 September 2018.

• Calculator:Herblore/Decanting