Highchart barchart column color auto change back to default color upon hover

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Javascript

Hi, I have some codes written in javascript where any value less than 80 will cause the barchart's column color to become red. I have did it but there seems to be a bug whereas the column color change back to default color everytime I hover over the column.
E.g. Red become blue.
Below are my codes:

function (chart) {

               var max = 80;

               $.each(chart.series[2].data, function (i, data) {
                   if (data.y < max) {
                       data.graphic.attr({
                           fill: 'RED'
                       });
                       chart.series[0].data[i].graphic.attr({
                           fill: 'RED'
                       });
                       hover: { color: 'RED' };
                       chart.redraw();
                   }
               });
           }

What I have tried:

1. Tried to search for online solution but below link is the best I can get.
http://stackoverflow.com/questions/7414287/how-do-you-change-the-colour-of-each-category-within-a-highcharts-column-chart