TAT Black Cap Unstable (TBC Unstable) is Dave Wombat's unstable culture of True Albino Teacher Black Cap. They typically have the black spot on the center of the caps, but they do not always grow in the typical small size and shape of stabilized TBC. Some dome caps, some flared caps, and various shapes and sizes, but just as spicy. TAT Black Caps is among the most potent of Wombat Lab's genetics.