High Level Alchemy (also known as high alch, hi alch or alching) is a non-combat spell used to convert items into coins at the best price a player could get from a specialty store. The amount of coins generated is normally 60% of the speciality shop price or 150% Low Level Alchemy prices.
High Level Alchemy is a popular way for mid and high level players to train their magic level, by buying or making valuable items and nature runes, then casting the spell on the items.
High (and Low) Alchemy can be cast on noted items, saving much withdrawal time from the bank, and simplifying the "click pattern", i.e. the player can place the stack of notes in the same position in their inventory that the alchemy spell is in the spellbook so that they do not have to move their mouse much to repeatedly cast the spell. Casting alchemy spells on stackable items will only alchemize one at a time. It is possible to alch around 1,200 items per hour for a total of 78,000 magic experience.
If the player attempts to cast an alchemy spell on a valuable item, the player will receive a warning message and be asked if they are sure they want to alch the item. The default threshold for this is items worth at least 20,000 coins, which can be adjusted by right-clicking the alchemy icon in your spellbook.
Some specialty shops may offer a higher price for certain items than the amount High Level Alchemy gives. For example, High Level Alchemy converts a gold necklace into 270 coins, but Grum's Gold Exchange in Port Sarim offers 315 if there are no gold necklace in the shop's stock. The price decreases 9 coins for each additional necklace in the shop inventory until it reaches a low limit of 45 coins when there are 30 or more necklaces. Some players sell up to about 11 items and then world switch to find another shop which has a low inventory.
There are also two general stores which do buy at High Alchemy prices: