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In adobe acrobat print property, there should be a check box for "print color as black" use that and try printing! :)
To convert an RGB PDF to Grayscale:
1) Open an RGB PDF.
2) Choose Tools–> Print Production
3) Select Device:RGB Convert as the document source color space.
4) Select Gray Gamma 1.8 or 2.2. You may need to experiment to see which gives you the best results.
5) Select Do Not Embed Profile from Conversion Options.
6) Click OK