Inks are obviously indispensible when stamping, but not all inks are the same. As long as I kept stamping on white paper I never noticed a difference, but one day I decided to do an experiment and stamp on shrink plastic.
The shrink plastic is not a porous surface and therefore I decided to give the ink a lot of time to dry before I shrunk it. So I stamped up my shrink plastic with tsukineko’s red Versa Color ink, waited a couple of hours and shrunk it in the evening.
As the image had shrunk without blurring, I deemed the experiment successful and inked up another piece of shrink plastic with green Versa Craft ink to see how it would look in green. This time I decided to use my hairdryer on a high heat-setting in order to dry the ink quicker. To my great horror the heat from the hairdryer caused the shrink plastic to start shrinking, but I reasoned that since I had already messed up the green print I might as well see if I could shrink the plastic all the way with the fan. The thing is that once I had finished shrinking the plastic I realised that the print had actually not been destroyed, but looked just as good as the one I had done previously.
I then proceeded to start coloring inside of the print, and that’s how I realised that the red ink lines would blur when I went over them with a pen, but the green lines were not affected.

Versa Color is a pigment ink, which means that you have a binder and lots and lots of little pigments which makes it an opaque color. It doesn’t heat set on glossy paper, so there is nothing for the ink to hold on to when it’s applied to a glossy surface.

Versa Craft on the other hand does heat set, so when I heated it up the ink got stuck on the glossy surface.

Dye ink and pigment ink are the two main types of ink. Generally it can be said that pigment inks have stronger colour because they ink sits on the outside of the paper, whereas dye ink tints the paper. So if you would use green pigment ink on yellow paper you would see a green print, but if you use green dye ink on yellow paper you would see a yellowish green print.

There are all sorts of hybrid inks out there nowadays which allow you to do different things. I just checked out Ranger Ink’s FAQ and was quite amazed at how many different qualities ink can have.