What colours can be found in black ink?

Question

What colours can be found in black ink?

Answer 1

it is usually a mixture of black and grey

Answer 2

Technically, black is the absence of all color. So, none.  

Answer 3

black & grey

Answer 4

In the ink I use, only two, blue and black. The black is colloidal graphite and pure carbon and the blue is from iron. By using colloidal solids, the particles stay suspended in the water/alcohol mixture which makes up the liquid part of the ink. It is a permanent ink which when it gets on your skin WEARS off rather than washes off because of the carbon and graphite which literally soaks into your pores. It is next to impossible to change or erase once it dries on paper, which is why I use it. Over time, the iron oxidizes and it becomes even more permanent as the iron chemically bonds with the fibers in the paper.

Answer 5

I do this as a lab with my students.  To find out, place a small print of ink on the center of a piece of filter paper and add water to the spot one drop at a time.  The polar water molecules will carry any polar pigments in the ink through the filter paper, creating a spreading stain.  The more nonpolar pigments will stay behind on the nonpolar filter paper.  Eventually, the pigments will all separate.

Each manufacturer of black ink has its own specific mixture of pigments.  I have seen greens, reds, blues, yellows, pinks...a whole spectrum.  Be careful, though...if your pen is waterproof, that means it is made entirely of nonpolar pigments and the water will be unable to separate them.  

Answer 6

depends on the ink, some black inks are dark blue, however if its black ink i would reckon no colors, as black is not a color but a phenomenon wherein the entire spectrum of light is absorbed by whatever material you are perceiving to be black.