Highlight a text with white background

[Eszter31797772atyl]

Hi,

I try to highlight a text in adobe acrobat to make it more visible and readable because there is a picture behind it.

But when I choose the Highlight tool and set it to white noting happens. If I change the color to something else like pink, the highlight appears. I also checked the opacity, it works for other colors exept the white. 

Is it even possible to highlight with white and if so, how could I make it?

Thanks!

[MikelKlink]

Highlighting is filling the selected area with the selected color in Blend Mode "Multiply".

The definition of Multiply in the PDF spec in particular explains:

When working with additive colours, multiplying any colour with black produces black while multiplying with white leaves the original colour unchanged.

In other words, it is expected that highlighting with white doesn't change anything.