DENVER (AP) -- Wondering if that brownie contains pot? Colorado has you covered.

A requirement that edible marijuana products come with a diamond-shaped stamp and the letters T-H-C - not just on the packaging but on the brownies, candies and other edibles themselves - takes effect Saturday.

The rule referencing marijuana's psychoactive ingredient was added after complaints that the treats look too much their non-intoxicating counterparts.

It is the first such requirement in any legal weed state. Colorado's new "universal symbol" for foods that contain marijuana is designed to give the treats a distinct look even after they're out of the packaging.

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Kristen Wyatt ~ Associated Press ~