Convert text in PDF to pure black

Hi all,
I have spent hours researching this with little to show for it, so I thought it's time to ask for help.
I am dealing with a situation where I need a batch solution to change the color of all the (vector) text in a PDF document to pure black.
From my research, I understand that:
1) It is not possible to do this in JS.
2) If I simply wanted to change the color of text from color to grayscale, I can use "Convert Colors" under Print Production to change the color space.
3) I can select the "edit text & images" command, select all objects in the page, and change the font color to black. But this method requires repeating the same for every page, and is not practicable for PDFs with many pages.
I have experimented using different conversion profiles (Gray Gamma, Dot Gain), but in all cases, I have been unable to change the color of text to black. It remains at gray, or is changed into a different shade of gray.
My question here is this:
When I select an object and go to the color tab of the Object Properties box, I see "Black & White" as one of the color spaces that I can choose to convert to in the drop down list. See screenshot immediately below:
If I choose "Black & White", and click the "Convert Colors" button, the text gets converted to pure black. But this method only works object by object.
But under the "Convert Colors" in "Print Production", the "Black & White" option which is available earlier is not available. See screenshot immediately below:
Why is that the case and what can I do if I want to batch convert all the text in my PDF doc to the "Black & White" color space so as to change the color of the text to pure black?
Thanks.
Best,
Jay

Hi Jay ,
Which version of Acrobat are you using?
If it is one of the old versions ,try updating it the latest one and see if that helps.
Launch Acrobat>Navigate to Help>Check for updates.
The second image that you have sent ,there is an option as "preserve black" in the same dialog box.Check mark that option and see if it helps.
Let us know how it goes.
Regards
Sukrit Dhingra

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