Another technique is to work with armour sets. Occasionally an armour set can be bought, split up into its component parts, and sold for a profit. Occasionally, the reverse will be true: the component parts could be bought and the armour set could then be sold for a profit.
Be aware that this method is only for experienced merchants, price changes must be monitored on not just one item, but sometimes five items or more simultaneously (the set price and all the component prices). Unexpected trouble obtaining or selling one of the component parts can quickly turn a profit into a large loss.
This method is extremely difficult (and not recommended) for F2P merchants, as they only have 2 slots to work with.
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edit Potion Decanting
The Method
Bob Barter, the potion decanter and herb expert of the Grand Exchange
Potion decanting is a great way of making money for the lower levels. In fact, you don’t need any levels at all to use this method for making money! This involves converting potions into a different doses to sell for a greater value than the original potion. Although currently on the GE a potion’s value is simply based on the amount of doses it has (a 2-dose is always half the value of a 4-dose potion), the potions’ values fluctuate in the min/max price range, and therefore the actual price鈥攖he price at which a dose can be sold on the GE鈥攐f a 2-dose potion may be higher or lower than that of a 4-dose potion.
One example of a potion to decant would be the Antifire potion: Buy a set (at the mid price or lower) of, let’s say 100 Antifire potion(3). Go to the Grand Exchange, and go to the southwest corner where Bob Barter is. Right click him, and select “decant”. He will then turn all 1, 2, and 3 does potions into the 4 dose versions of each. This is essentially him using them all with each other, like players can do. Doing this with several inventories of potions converts the 100 (3) antifires into 75 Antifire potion(4), which can then sell for a higher price than the component parts (in this example, above the mid price). This is typically not a great profit-making scheme, but if the demand is there, profits can be increased proportionally with the investment.
