This is my source code
</search>
<option name="charting.chart">column</option>
<option name="charting.drilldown">none</option>
<option name="refresh.display">progressbar</option>
</chart>
A column chart already has colours, that's how you are able to distinguish the columns from the background.
It is giving me a single color . Can I distinguish the color or not.
Each series has a single colour. If you want each column to be a different colour, you need to rearrange your data so that the values are in different fields (columns in a table).