Smoke rune

Smoke Rune is a members-only item on the OSRS Grand Exchange in the runes category.

In-game examine text: "A combined Air and Fire Rune."

It has a Grand Exchange buy limit of 18,000 every four hours, a high alchemy value of 12 gp, and item ID 4697.

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Smoke Rune currently has a flip margin of −1 gp, which isn't profitable to flip right now despite 3,783,533 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.