pdf conversion of maths give the wrong colours

I have altered the colour scheme for my Writer, so that the background is black and the letters are gray. The math editor, quite correctly, uses the standard document colour (gray) to write maths. Staying in Writer, this is fine.

But the math placed in the document is inserted as a picture. When I now want to create a pdf, with the pdf butten in the top left, the following happens.

  • The normal text of the document is considerd as “document color” and therefore printed as black in the pdf (just as you would want).
  • The maths is considered a picture and therefore the text is printed gray in the pdf. This is not what you want.

Is there a way to circumvent this? I want the maths to be printed black as well. (Or can it be considered as a kind of bug?)