Does your chart has any data with negative values? PowerPoint by default uses the same fill color for negative values as is used for positive values. Of course, you can override this nature of PowerPoint using the Invert if Negative option, that we last explored at the end of our Changing Fills and Outlines of Charts tutorial. In this tutorial, let us explore this option further.
Learn how you can highlight negative values in a chart within PowerPoint 2011 for Mac.

