HI @mmirG - If you’re seeing a pattern that looks like this: https://www.kepstin.ca/wp-content/uploads/2016/09/13842659217.jpg
then you have a “CCD” optical sensor scanner with a CCFL (florescent light). Unfortunately, there’s not that much you can do about the pattern…
One suggestion that might work is to scan the CD, then rotate it 90° and scan it again. You can then combine the two images in photoshop or gimp to take the best parts of both.
If you’re planning to do a lot of CD scanning, it might make sense to look at a different scanner. The ones listed under the “Scanners with CIS Sensors” header on https://www.kepstin.ca/blog/recommended-scanners-for-album-art-scanning/ won’t have this issue with colors on CDs.
If you’re feeling like a DIY kind of person, you can also try finding a sheet of diffuser plastic and put it between the scanner bed and the CD. I get good results with that: https://www.kepstin.ca/blog/scanning-cds/