What I like the most about darker seamless paper is that it can be lighted a litle bit, and that creates a gradient from light gray, to darker gray, to darkest grays or even to solid black. Because a darker seamless papper does not reflect a lot of the light that hits it, it makes it farless easy to work with and not get a lot of reflected light coming back toward the subject.
Black seamless paper has low reflectivity, and gives a rich, saturated color when a gel is fired onto it at low flash power. This B&W photo of Jenni was made with a purple gel fired onto black seamless papper (the purple-looking gel color turns from purple to BLUEwhen photographed, weird!). The very low-powered flash that hit the background paper gave a nice range of tones when converted to B&W.
The thing about paper is that is shows little to no texture when the DOF is enough to keep the backdrop within the overall depth of field; actually having
too much DOF is a big issue with APS-C sensors and flash f/stops like f/8,f/9,f10,f/11,f/13.
f/7.1 at ISO 400, 130mm zoom shot