[Solved]-How do I change a specific bar color in Highcharts Bar Chart?-Highcharts

You can just add a 'color' property to the series data. For example, the following has multiple points defining different colors, and a few that use the default bar color:

series: [{
        data: [{y:10, color:'red'}, {y:20, color:'blue'}, {y:30, color:'#A84646'},
               {y:40, color:'rgba(253, 134, 9, 0.7)'}, 50, 60]
    }]