A Renko Black Trend is a series of consecutive black bricks. Renko charts are built from bricks of a fixed size that ignore time and small price moves: a white brick is added when the price rises by one brick size, a black brick when it falls by one brick size. Several black bricks in a row show a steady downtrend with no rebound large enough to print a white brick, and trend followers often stay out or short until the first white brick appears.
