When a work of fiction creates a new trait of a known element or compound--as opposed to Unobtainium, which generally just makes up new substances out of whole cloth. Such is usually done in service of the Rule of Cool. There may be some overlap when real names are used for obviously fictional elements. May very, very rarely intersect with Science Marches On, but usually this trope applies either where science has already long since marched on, or some twisted path entirely off the parade route. Subtropes: * Hollywood Acid * Unobtainium Examples of Artistic License Chemistry include: