Ehhh, as someone who's dealt with and seen a lot of blood in their life you'd be surprised how bright it can be when not pooled into droplets or coagulated. Even relatively fresh blood smeared on an arm or something, as an example, can be pretty bright red. Adittedly though, after a few minutes of exposure to air, the color will darken a bit.
If you're wanting it to be bit more dried looking start shifting it towards dark brown/bordering on black, but don't lower the saturation levels at all. Blood, in any stage of dryness, tends to have a pretty saturated color to it (unless of curse you've got some weird lighting going on). If you're aiming at all for realistic I highly recommend avoiding desaturated reds, and oranges. Speaking of orange, the only time you'll see /any/ orange in blood is if the character is an alien with orange blood, or if the character has leukemia. If you want to add color depth purples tend to work surprisingly well.
Have a few examples I found fiddling around that look fairly realistic:
Tutorial 1
An example of slightly less fresh blood (drawing)
(and I was going to post a reference of real blood here, but it's surprisingly hard to find a good example that isn't crazy gorey so I'll let you find that yourself.)
Beyond that I'd suggest looking up actual medical pictures of trauma patients. It's gross if you don't have much of a stomach for that kinda stuff, but it's the best reference you'll get. : )
