Color is darken when printing a web page

I have a simple web page written in HTML and CSS, with some colored text. When I click print preview, some color are seriously darken but some are fine. Since -webkit-print-color-adjust is not a standard yet, I don't want to use it.

For example, #f00 red text and #0f0 green text are prefect in printing. But yellow, #ff0 is much darker than usual. Even #fff white text looks gray (which should not be seen in white background).

Different browser give sightly variation of the level of darken.

What is the reason behind the color change and how to solve this problem?

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