Grayscale printing, when to use?

I have a Pixma Pro-100. Under what circumstances would I print in “grayscale”?
Nikon D600; Nikkor 50mm f/1.8G, 85mm f/1.8G, 70-300mmG f/4.5 - 5.6 VR
Solved!
Go to Solution.

I understand what you are saying but I think that I am asking a somewhat different question.
I thought that “Grayscale” printing involved blending the color ink to arrive at different shades of grays. The Pro-100 has three monochrome inks, which should print in various shades of gray. Under these conditions, when (if ever) should grayscale printing be used? When I check the ”Print Black & White photo” box is that the same as printing in “grayscale”?
Nikon D600; Nikkor 50mm f/1.8G, 85mm f/1.8G, 70-300mmG f/4.5 - 5.6 VR

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PrintImagesTest.mxml
=================
<?xml version="1.0" encoding="utf-8"?>
<s:Application
    xmlns:fx="http://ns.adobe.com/mxml/2009"
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            import flash.utils.setTimeout;
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<?xml version="1.0"?>
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