Aldarium

The Aldarium is a members-only Old School RuneScape item — “A special alchemical ingredient used for creating potions.”. Its Grand Exchange buy limit is 13,000 per 4 hours. Right now it buys at 48,959 gp and sells at 50,471 gp — a net margin of 503 gp (1.0% ROI) after the 2% Grand Exchange tax of 1,009 gp. High alchemy yields 60 gp.

To flip it, place a buy offer near 48,959 gp and a sell offer near 50,471 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.