score:6

Accepted answer

I found a way like this and its working :-)

plotOptions: {
    ohlc: {
        color: 'red',
        upColor: 'green'
     }
},
series : [{   
    type: 'ohlc',                 
    name : 'Stock Price', 
    data : [],
    yAxis : 0,                            
}, {   
    type: 'column',                 
    name : 'volume', 
    data : [],
    yAxis : 1,                        
}]

score:2

You can use these to change the colors for down line and up line colors as well.

plotOptions: {
    candlestick: {
        color: 'red',
        upColor: 'green'
        lineColor: 'red',
        upLineColor: 'green'
    }
}

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