Pestle and mortar

A Pestle and mortar is an item that is used to crush items into fine powder. It is used mainly in Herblore, though it is used in many quests as well. On 9 November 2009 the pestle and mortar grinding code was rewritten. It can be bought from shops in cities such as Keldagrim, Taverley, and Entrana or in Grand Exchange. It can be used to grind several items in order to produce a dust. It is used with the following:
 * Unicorn horn - produces Unicorn horn dust which is used in Anti-poison potions.
 * Chocolate bar - produces Chocolate dust, used in Energy potions and Chef's delight brew. Also used in plague city.
 * Kebbit teeth - produces Kebbit teeth dust for use in the Hunting potion.
 * Gorak claw - produces Crushed gorak claw, used in A Fairy Tale Part II Quest and making Magic essence potion.
 * Bird's nest - produces a Crushed bird's nest which is used in Saradomin brew.
 * Desert goat horn - produces Goat horn dust for use in Combat potions.
 * Sq'irk - produces Sq'irk juice when crushed into a Beer glass during the Sorceress's Garden minigame.
 * Charcoal - produces Ground charcoal used in Digsite Quest.
 * Rune shards - makes Rune dust in Garden of Tranquility.
 * Ashes - makes ground ashes.
 * Poison karambwan - makes Karambwan paste, which can be used to poison spears.
 * Suqah tooth - makes ground Suqah tooth.
 * Fishing bait - makes Ground fishing bait, which is used to feed pet birds.
 * Diamond root - makes Diamond root dust, which is used in the Glorious Memories quest.

''Note: A pestle and mortar cannot grind silver bars to silver dust. To get silver dust, grind a silver bar in the bone grinder used for the Ectofuntus.''