Silk

Silk is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "It's a sheet of silk."

It has a Grand Exchange buy limit of 18,000 every four hours, a high alchemy value of 18 gp, and item ID 950.

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Silk currently has a flip margin of +0 gp, which isn't profitable to flip right now despite 21,539 trades over the last 24 hours.

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