Forgers commonly use the bottom of an original broken vessel, which has no commercial value, and make a new fake vessel on top of it.
The TL operator generally takes samples for dating from the bottom, avoiding damage to the image of the artwork.
However, producing fakes with this method calls for expertise on the subject, as well as expensive instruments.
Instead, a less sophisticated method that would deceive TL testing is to reuse original broken and unmarketable pieces.
Carbon can bond to itself and forms an enormous number of important molecules, many of which are essential for life. The two most familiar forms of carbon—diamond and graphite—differ greatly because of the arrangement of their atoms.