I am creating a PDF document that has a table with pyjama stripes. The grey stripes are defined using RGB with equal amounts of each colour.
I'm want to make the stripes light enough so that you can write on a printed copy with a #2 pencil and easily read the text, yet dark enough so that the tables rows are easy to follow, both on screen and in print.
The PDF document will be printed on a wide variety of computer printers, but probably mostly on laser printers.
I've benchmarked the PDF on a Konica Minolta bizhub C550 printer and a Dell lcd screen and and 0.9 (=10% black) seems to be about right.
Now to my question:
At what blackness level will some computer printers print white instead of grey?
(I am aware that this question does not have an absolute answer, but your experiance and real-life examples are appreciated)
Side note (for extra credit):
I also have some other grey areas in my PDF. I noticed that as I reduced the blackness of the pyjama stripes the other grey areas became darker in the printed copy. I have verified that this is not just an optical illusion by cutting out the other grey areas and placing them next to each other. Why does this happen?
Edit (in response to JohnB's comment):
The choice of RGB over CMYK is a random one. If CMYK will result in better results I wouldn't mind switching. If you recommend a CMYK setting please be aware that I would rather not use the colour trays of printers that have separate trays for black.