HP C8180 poor printing performance

Hi,
I have experienced something peculiar which is bothering me, has anyone else experienced this? If I use third party photo paper (premium + quality), my printer deliberately prints a bad picture, presumably to encourage me to stop using non HP paper. I discovered this when I noticed HP paper took much longer to print on and was much more vibrant. So, how did the printer know which type of paper I was using? Well, the reverse side of the HP paper has a bar code printed on it and when I duplicated the code on the back of the third party paper, voila! the printer then printed a great picture. Surely this cannot be ethical. Any comments please?
The poor pictures appear very soft in focus and have a yellow tinge. At first I was alarmed that my new (expensive) camera was rubbish and then did a little research.
Pocketbook

I would suspect the light cyan is not printing correctly.  I believe the light colors (light cyan and light magenta) are not used when printing on plain paper.  Try printing a diagnostic test page as shown in this page.  Does the light cyan area print properly?
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
If your problem is solved please click the "Accept as Solution" button ------------V
If my answer was helpful please click the "Thumbs Up" to say "Thank You"--V

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