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Ink is carbon-black. It does not come in other colors. Some may add ink to an iron-oxide pigment to enhance its darkness but carbon does not "bond" to iron oxides. Ink can migrate easily if used by a technician who does not understand its properties and knows how to use it properly. I'm afraid you are mixing apples and oranges here. The ONLY color that I could imagine someone mixing carbon-black into is an iron-oxide black. Those who add it to other colors possibily do so thinking the pigment it is mixed into will last longer. The only thing they can expect from this is an eyebrow or eyeliner that fades as carbon-black does, and that is to a gray (unique to some carbon-blacks,) or to a blue/gray (unique to other carbon-blacks.) Carbon-black appears to "stain" the skin it is tattooed into. I would study up more on ink before adding it, or any pigment that may have it mixed into it to my inventory. It is vitally important that technicians understand the source of all their pigments they use. Some are iron-oxides, some are derived from organic chemistry, and some are synthetic (a synthetic version of iron-oxides) in source. There are classes available to help technicians understand pigment formulation.
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