Usually when you click print and the box appears with printer properties, number of pages to print and size etc, there should be a document properties tab and the option to make it print darker, also check that the "Print in Grey Scale" is NOT ticked.
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Usually when you click print and the box appears with printer properties, number of pages to print and size etc, there should be a document properties tab and the option to make it print darker, also check that the "Print in Grey Scale" is NOT ticked.