Clay

Clay is a free-to-play item on the OSRS Grand Exchange in the ores category.

In-game examine text: "Some hard dry clay."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 1 gp, and item ID 434.

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Clay currently has a flip margin of +0 gp, which isn't profitable to flip right now despite 93,800 trades over the last 24 hours.

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