Volume can be misleading sometimes. Generally increased volume at the bottom (or support) is bullish. However, if you see a bottom form with low volume and then the first attempt to rally to a strong resistance point shows high volume in a short or intermediate downtrend, that may not be bullish volume even though it is a black (or green) volume spike. You need to pay attention to the candle and if there is a significant top shadow that is an indication of a sell-off at the top. Looking at the 5 or one minute chart or a tick chart if you have access to one will tell you where the greatest volume took place. High volume on low prices is bullish, high volume on high prices is bearish!
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