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The Psychology
In a downtrend or during a pullback within an uptrend, a long black day occurs signaling the bears being in control. The stock gaps up the next day but then sells off to close at the same level as the previous day. The more times a stock can successfully test and hold a low, the higher the chance a reversal will occur once the seller become exhausted. Strength the following day with volume would confirm the pattern.

Identification
A long black day is followed by another black day with equivalent closes both days.

Pattern: reversal
Reliability: high