PrintOptions.PrintColorType (PowerPoint)

Returns or sets the way the specified document will be printed: in black and white, in pure black and white (also referred to as high contrast), or in color. Possible return values are ppPrintBlackAndWhite - Black and White, ppPrintColor - Colored, ppPrintPureBlackAndWhite - Pure Black and White.

The value of the PrintColorType property can be one of these PpPrintColorType constants. The default value is set by the printer.

ActivePresentation.PrintOptions.PrintColorType = ppPrintBlackAndWhite