Steps to reproduce:

- Run the attached PrintGrayscale sample which uses Chromaticity.MONOCHROME attribute to print a monochrome page on macOS
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        PrintRequestAttributeSet attr = new HashPrintRequestAttributeSet();
        attr.add(Chromaticity.MONOCHROME);
        ...
        PrinterJob job = PrinterJob.getPrinterJob();
        job.print(attr);
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> java PrintGrayscale
Default service: IPP Printer : HP Ink Tank 110 series
Print with chromaticity: monochrome
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The page is printed as color instead of monochrome.