How to flip Umbral potion (unf) in OSRS

Flipping Umbral potion (unf) on the Old School RuneScape Grand Exchange currently makes about 223 gp profit per item after the 2% GE tax: buy near 2,350 gp (the instant-sell price) and re-list near 2,625 gp (the instant-buy price).

• Buy at (instant-sell): 2,350 gp
• Sell at (instant-buy): 2,625 gp
• Margin after 2% tax: 223 gp (9.49% ROI)
• 24h volume: 172,998 (extremely liquid)

The flip, step by step

1. Place a buy offer at or just above 2,350 gp (the current instant-sell price).
2. Wait for the fill. Umbral potion (unf) is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 2,625 gp (the current instant-buy price).
4. The GE takes 52 gp tax (2%) per item when it sells, leaving 223 gp profit each.
5. Repeat up to the buy limit.

Margins move constantly. Re-check the live Umbral potion (unf) numbers and price chart on GrandExchange.com right before committing.