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You can also choose to recolor individual tasks, but you will need to tweak your data a bit to split your tasks into different series (categories). Open the Edit Chart Data table and:
i.Add several new rows beneath your Duration line, as shown in the image below. This will generate a series of different colors for your tasks, which you can customize however you wish later.
ii.Now, to move a task into a different color category, cut (Cmd + X) its Duration value from the original row and paste it (Cmd + V) in whichever of the newly added rows (keep the same column). You can see how I set up the new colors for my graphic in the image below.
iii.The tasks with their duration values distributed on different rows will be considered as distinct series, while the ones with duration values on the same row represent a single series. This means you can further customize the former separately and the latter at once, which includes changing the default colors generated by Keynote earlier. If you want to do so, double-click on the desired bar, go to the Style tab and use the Color Fill indicator to select a new shade. Here is how I changed the default colors for my chart: