Why is the second green candle stick green? Given that its closing price is less than the previous candlestick's closing price, shouldn't it be orange?
Source: coninbase 1m chart for ethereum: https://pro.coinbase.com/trade/ETH-GBP
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When using a solid candlestick chart, a green candlestick means that the opening price for that period was lower than the closing price for that period. In other words, the price went up during that time. So in your example, the price dropped from the close of the prior period, but rose back up slightly by the end of the period.
However, when a chart uses solid and hollow candlesticks, a hollow candlestick represents an upward movement over the period, and a green cnadlestick means that the price closed higher than the previous period's close. So a hollow green represents a period where the price rose but ended below the prior close.
Since all I see on coinbase are hollow green and solid red (or orange) candles, I suspect that they are just using hollow green candles to represent an upward move in that period and solid red to indicate a downward movement in that period, and not comparing to the prior ending price.