I have a black and white diagram, and want to change the lines of the diagram into a specific hex color in Photoshop (CC). I've erased the background, which I don't need, and in the hue/saturation have managed to colorize the black. The problem is that I can't find a way to set it as a specific color, as there's only sliders to adjust, and doing it by eye always ends up being different from what I need. Does anyone have any insight into whether or how that's possible to do?
There may be a different and better way entirely, and the method I've used is simply the thing that has got me closest to my goal but could be a dead end. The other color changing tricks I do know (selection tool, masks, and so on) are impracticable for this diagram, which contains dotted lines and lots of other fiddly bits, but as it's all one color (black) I assumed it would be easy to change in one go. It hasn't been created digitally, so I can't adjust the original.
I'm fairly new to photoshop so might be overlooking something, but after a lot of digging I can't work this out. Thanks!