While I've never had a complaint, I did have to force my text to black.
I didn't realize it, but my source text was originally gray and while it looked fine on some Kindles, on the paperwhite it looked far too light.
From Scrivener, I selected all the text then chose black from the color palette. Saved and uploaded the mobi. I haven't had any complaints yet. I bought a paperwhite to test and also tested on my original Kindle as well as a few Kindle Apps.
I'm not sure if there is a way to not specify a color other than to open the HTML/CSS and edit the styles to remove all color reference. If you do edit the raw styles, I think it should be HTML Color Code #000000.
I didn't realize it, but my source text was originally gray and while it looked fine on some Kindles, on the paperwhite it looked far too light.
From Scrivener, I selected all the text then chose black from the color palette. Saved and uploaded the mobi. I haven't had any complaints yet. I bought a paperwhite to test and also tested on my original Kindle as well as a few Kindle Apps.
I'm not sure if there is a way to not specify a color other than to open the HTML/CSS and edit the styles to remove all color reference. If you do edit the raw styles, I think it should be HTML Color Code #000000.