PK Søreide

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Try using 'documentFormat.of("application/octet-stream")' which is telling the printer to auto-detect. I have experienced some printers only accept that document format.

You can get a description here: [Ensuring that a contrast ratio of at least 7:1 exists between text (and images of text) and background behind the text](https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests)