BNT is in a down trend. When is a good time to buy? When the down trend is finished and a new up trend is forming. But don't buy too early - wait for the trend to turn and the chart to show confirmation that the down trend is finished. I like to use count back line analysis as a buy signal = buy on the daily charts when price closes above the height of the third lowest significant candle = green line. But not before. This charts suggests to me that we will see lower lows before higher highs. A solid base has yet to form.