Thought the synthie users would be interested in this technique.
Uses Speed ball ink and alcohol.
I just bought a synthetic that I love, but ordered it in a color that is great but needs to be a tad darker. So I am going to try this method without saturating the hair. Using it on the bottom of the top layer and the top of the bottom layers and trying to retain some of the original mix. DX147 is way too light for me.
But I also like this possibility because I can choose a unit without worrying about what color is available.