How to flip Lantadyme potion (unf) in OSRS

Flipping Lantadyme potion (unf) on the Old School RuneScape Grand Exchange currently makes about 16 gp profit per item after the 2% GE tax: buy near 1,175 gp (the instant-sell price) and re-list near 1,215 gp (the instant-buy price).

• Buy at (instant-sell): 1,175 gp
• Sell at (instant-buy): 1,215 gp
• Margin after 2% tax: 16 gp (1.36% ROI)
• Buy limit per 4 hours: 10,000
• 24h volume: 290,091 (extremely liquid)
• Max profit per limit cycle: 160,000 gp on 11,750,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 1,175 gp (the current instant-sell price).
2. Wait for the fill. Lantadyme potion (unf) is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 1,215 gp (the current instant-buy price).
4. The GE takes 24 gp tax (2%) per item when it sells, leaving 16 gp profit each.
5. Repeat up to the buy limit (10,000 per 4 hours), a full cycle is 160,000 gp on 11,750,000 gp of capital.

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