From paper to project
Choose two colours plus a dark text colour.
Print a sample with the settings planned for the full batch.
Note the paper name and settings on the back.
Check small lettering and pale areas in usual lighting.
Pick a combination that remains readable without relying on colour alone.
Keep the sample and retest after changing paper or ink.
Check it with an example
A label should remain readable in greyscale. Compare dark lettering on pale coral and on yellow before choosing.
If it does not turn out as expected
Increasing saturation is not a universal fix. Avoid thin type on very dark backgrounds and compare tests with matching settings.