How to flip Barrel of demonic tallow (full) in OSRS

Flipping Barrel of demonic tallow (full) on the Old School RuneScape Grand Exchange currently makes about 5,169 gp profit per item after the 2% GE tax: buy near 22,271 gp (the instant-sell price) and re-list near 27,999 gp (the instant-buy price).

• Buy at (instant-sell): 22,271 gp
• Sell at (instant-buy): 27,999 gp
• Margin after 2% tax: 5,169 gp (23.21% ROI)
• 24h volume: 2,351 (liquid)

The flip, step by step

1. Place a buy offer at or just above 22,271 gp (the current instant-sell price).
2. Wait for the fill. Barrel of demonic tallow (full) is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 27,999 gp (the current instant-buy price).
4. The GE takes 559 gp tax (2%) per item when it sells, leaving 5,169 gp profit each.
5. Repeat up to the buy limit.

Margins move constantly. Re-check the live Barrel of demonic tallow (full) numbers and price chart on GrandExchange.com right before committing.