What type of round is identified by the color black for the AT-4?

The correct identification of the AT-4 round with a black color is associated with the High-Explosive Anti-Tank (HEAT) type. The HEAT round is specifically designed to penetrate armored vehicles and engages in a specific mechanism where a shaped charge focuses energy into a jet that can effectively breach armor.

The black coloration is a standardized marking that indicates this ability. Understanding the properties of the HEAT round is vital for operational effectiveness, as it allows troops to recognize the appropriate ammunition to use in various combat scenarios, particularly against armored targets. Other color coding and types of rounds exist, but they do not correlate with the black indicator on the AT-4, making the HEAT round the definitive choice here.