21ST CENTURY HEADLINES: Colorado gives marijuana candy a new look to avoid confusion.

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. In other words, a pot cookie being passed around a high school cafeteria no longer will look so innocent, giving parents a way to identify marijuana edibles without smelling or tasting them.

That seems like a prudent regulation.