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A candlestick chart shows each bar as a color coded rectangle (called the candle body) representing the range of trading between the open price and closing price of the period. If the closing price is higher than the opening price, the candle is colored with the user specified up color, otherwise, the down color.

Vertical lines (called wicks) are drawn protruding from the upper and lower edge of the candle body to represent the high and low extremes of trading during the period. Investor/RT always paints down candles filled with the down color. Up candles, however, are drawn hollow with the frame of the candle body colored with the down color. This makes up and down candles easily distinguishable when printed in black and white. The user may elect to have up candles painted solid in the up color rather than painted hollow. This option is set in Chart General Preferences.