How to enable black and white print in QZ tray

[Bharat Honey]

How to enable black and white print in QZ tray on Amazon seller flex portal my browser in MS Explorer  

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BEST REGARD 

BHARAT UNANI PHARMACY

PLOT NO 20 MAILARDEV PALLY

INDUSTRIAL AREA (HYD)

9399951704  /  04065705355

[Lite Finocchiaro]

Bharat:

Have you reached out to Amazon? They should be your first line of support for printing issues, as we have no control over what data they send to their end-users.

If you can describe the problem with more detail and provide logs, I may be able to send you a substitutions file that overrides some of the settings they use, but this would depend on both their data and your printer's capabilities.

https://qz.io/docs/faq#logs

From the QZ Tray Icon:
Advanced, Troubleshooting, Zip Logs (To Desktop)

If you need the info on the logs to stay private, you can reply with only sup...@qz.io on copy

I look forward to your reply.

Kind regards,

Lite Finocchiaro

VP, QZ Industries

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[Lite Finocchiaro]

Bharat:

I have added qz-p...@googlegroups.com back on copy. 

I checked with the amazon technical team about just basic changes of printer preferences which didn't work.

You must insist that they escalate your issue, then. I have no doubt that other users are also affected by this, and Amazon is responsible for end-user support.

Unfortunately, the logs you pasted into the email body were not helpful, showing only idle connection timeouts (you should bring this up with Amazon as well, as they can add a few lines of code to prevent this). 

If you would like me to review them, please zip the entirety of the logs and attach the zip file as previously instructed, but I don't think the logs are necessary at this point.

I am using Java 8 with QZ tray

For what it's worth, QZ-Tray 2.2.x ships with its own java runtime, and 2.2.5 uses Java 11. This does not affect the system-wide Java version on your PC. You can see all of the library versions in use by QZ-Tray here:

https://localhost:8181/

As a workaround solution, I propose you try the attached substitutions file to use grayscale printing for color print jobs from QZ-Tray. I am afraid I do not have a color printer here to test on, but this should work. We have used the substitutions file for many other situations where the web app maintainer did not satisfy the user's printing preferences.

https://qz.io/docs/substitutions

If this solves the problem, please let us know.

Kind regards,

Lite Finocchiaro

On Tue, Sep 23, 2025 at 3:06 AM Bharat Honey <bharat...@gmail.com> wrote:

Thanks for the reply, I checked with the amazon technical team about just basic changes of printer preferences which didn't work.

I am using Java 8 with QZ tray 2.2.5 provided by amazon.in the problem is whenever order is being processed print of label and invoice comes automatically, which is in color on my HP ink Tank 315 printer i want this to converted in black and white from my printer settings its in black and white 

I need your help in this regard.

[snipped logs]