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 50,778 gp and sells at 52,266 gp — a net margin of 443 gp (0.9% ROI) after the 2% Grand Exchange tax of 1,045 gp. High alchemy yields 60 gp.

To flip it, place a buy offer near 50,778 gp and a sell offer near 52,266 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.