About three years ago I posted about working on brown paper, and to this day that's the most-clicked post on my blog. It seems a LOT of people are looking for information about it.
I still like Rives BFK Tan (technically, it's printmaking paper) more than any other paper I use. But these days I use a lot more watercolor on my Rives paper. Also, in the time since I wrote that previous post, I've discovered Micron pens.
The fine black lines you see in these three pieces are all Micron pen. Lightfast, waterproof, great for mixed media work.
If you make art you may have found that, when you scan a thing you created in watercolor, your scanner kills the colors deader than a doornail. Your greens and yellows turn brown, your oranges get burnt, it all goes sideways, and there's not much your photo-editing program can do to fix any of it.
For reasons I do not understand, this problem is much less pronounced with watercolors on tan paper. You'll still have some shifting but for the most part your art will look like your art. And the shifts that do happen are things that you can at least somewhat improve in Photoshop.