
Beginners Guide - Decanting
Good evening,
The following is a beginner-friendly guide for anyone wanting to make a bit of OSRS gold using potion decanting.
You can use the decanting tool here: https://runemargin.co.uk/decanting
Note: you can also use OSRS Wiki – just do a google search.
Theory
People often sell partly used potions on the Grand Exchange because they don’t want them sitting in the bank, or they want quick exp and have no use for the potions. A 1-dose, 2-dose or 3-dose potion is usually less convenient than a full 4-dose potion, so these can sometimes be bought cheaply.
On the other side, most players prefer buying 4-dose potions because it is easier and cleaner. Nobody wants to mess around buying random doses when they can just grab the full potion.
Put those two things together and there can be profit.
You buy the cheaper dose combinations, decant them into 4-dose potions at the Grand Exchange, then sell the finished 4-dose potions back.
Warning
This method requires membership, as potion decanting is done through Bob Barter at the Grand Exchange. There is nothing stooping F2P from decanting themselves – but you won’t find me doing it.
Step 1: Get some starting GP
You do not need a huge cash stack to start. Pretty much any gp value will get you started – but its nice to be able to buy a full stack of potions while you’re out questing. I recommend 200k min!
If you have more money, you can scale it up, but do not throw your whole bank at one potion straight away. Start small, test the margin, then increase once you understand how quickly the potion buys and sells.
Step 2: Find a potion
Use the decanting page:
https://runemargin.co.uk/decanting
The tool looks at the current prices for 1-dose, 2-dose and 3-dose potions, then compares the cost of turning those doses into a 4-dose potion.
The important columns is RM Score – a more realistic score that weighs profit against trade volume and buy limits.
Do not just pick the highest profit item. Sometimes a potion shows a huge margin but barely trades. The RS Score helps filter out those traps.
Step 3: Buy the doses
Once you have chosen a potion, buy the required 1-dose, 2-dose or 3-dose versions from the Grand Exchange.
Do not insta-buy unless you are only testing with a tiny amount. Put in competitive offers and let them buy naturally.
For example, if the tool shows that buying certain dose combinations can make a 4-dose potion cheaper than buying the 4-dose directly, that is your margin.
Make sure you pay attention to volume. If the volume is low, you may only be able to buy a small number before the market dries up.
Example flip - 1s and 2s will make more money. 3s will flip quicker
Step 4: Wait
Wait for the potions to buy.
Check your offers occasionally to make sure you are still competitive. If nothing is buying, your offer may be too low or the market may have moved.
For beginners, I would avoid leaving big buy offers in overnight. Potion prices can move, and a margin that looks good now might not look good later.
Note: I tend to use 2 slots to buy potions through a session.
Step 5: Decant the potions
Once your doses have bought, take them noted to Bob Barter at the Grand Exchange. He can decant your potions into 4-dose versions for free.
This is the key part of the method. You are not making the potions yourself; you are simply turning awkward dose amounts into the more useful 4-dose version.
Step 6: Sell the 4-dose potions
Put the finished 4-dose potions back on the Grand Exchange.
List them just below the current sell price. Do not undercut by thousands. If other people are doing the same method, massive undercuts just ruin the margin for everyone.
Usually, undercutting by 1 gp is enough.
Check occasionally to make sure you are still the cheapest seller. If someone undercuts you, update your offer slightly.
I usually put on overnight. Always nice to come back to a nice green bar in the GE.
Job done!
Final comments
Potion decanting is not always the flashiest money maker, but it is simple, beginner-friendly and can be a nice low-effort way to build your cash stack.
If anyone wants more quick guides like this, let me know.
Also please feel free to reach out privately or on discord. I’m happy to help and improve!