Radioactive Uranium Marbles

Above, under UV (black) light.

From the website:

Radioactive Uranium-Doped Glass Marbles

The marbles, each about 5/8" in diameter, contain approximately 3% uranium-238 (by weight).

This small amount of uranium is added to the glass while it's still in the furnace and in a molten state.

As the uranium dissolves into the red-hot glass, it takes on the telltale pale green color of uranium glass.

Because of the added uranium in the glass, the marbles glow brightly under ultraviolet light (black light).

The small amount of radiation that the marbles emit will also register on sensitive Geiger counters.

The marbles do not emit high or dangerous levels of radiation, and are completely safe to handle.

A small sample of uranium ore (the type used to make this particular type of glass) is included.

Oh, yeah, one last thing: Don't try to carry them onto a plane — or pack them in your checked luggage.

How do you spell "Please step into this room?"

Below, under normal light.

Three for $15.

Wait a sec — what's that song I'm hearing?

[via Milena]