By now there are enough tutorials on blending, and colouring and all that, so I wont go into that.
The most amazing thing is, I actually USE black! Unless I've inked in a lighter colour. If I ink in grey I wont make my darkest colour darker than that grey but that's another matter.
These 3 illustrations all have black hair, but they're all different because of the under colour and highlight. (I've listed the colours beside each). You'll see that each of the hairs has a different colour highlight, but what else is that the black area is also holding onto characteristics of the base colour.
Different Ethnicities have different types of black hair. Blue-black is most common, and brown black and then the grey black. More than that black hair can be very shiny and reflective so it will reflect much of the surrounding colour. if your person is in a cold environment, it would serve you well to do some cool colours for the under colour of your hair. if they're near a fire, a warm or red tone would really help enhance that in your image.
Cedarseed has dome a nice little chart of Human Types.
Now here is the step by step of the colouring hair process
Please forgive the image quality in these. I took photos as I went and they just didnt turn out as well as I like. It was dark.
here is just a base coat of a red colour. I choose R27 for this one. It doesn't have to be smooth or perfectly clean. Just slap it down.
I added a layer of R59 (not R56 as I indicated in the picture. That was a typo) I used the brush nib to stroke in the colour and left some zig zaggy hair shines along the high points of her bangs, hair and ponytail. This is a style thing. you can make hair shines/highlights in as many ways as there are people on the planet. This happens to be my way. I tend to draw rather rounded characters so the jagged highlights are a nice contrast for me. anyway, blend that all smooth with your original colour R27
Now I'm adding black. Bring it right on up to the highlight but leave a little bit of both colours showing in the highlight. that will add some dimension to your overall highlight colour. (why did I write R53? Its R59!)
take your original colour and blend the black into the highlight a little. you don't have to. you can leave the highlights pure red but I find that blacking them out a little helps unify the overall look of the hair.
The very first picture in this entry in the final scanned sketch if you want to see the colours a little better.
I hope this was useful to someone, and maybe gave you some ideas for taking your Copics to the next level!
Side note (AKA shameless plug)
Thank you to all the wonderful people who have followed my blog! Please don't forget to check out my other blogs like Animated Guru where I post all my art projects, works in progress etc, the before mentioned Gurukitty studio's blog, and Experimental Guru where I (occasionally) post tutorials and information on other art mediums I use!
Thanks for following me, I appreciate all your support and wonderful comments! <3