Caligo Safe Wash Ink - Extender (Transparency) - 75 ML

This ink is my current favorite for oil based ink. I love that it comes in tubes, and that they stay good to use for a really long time after mixing. I save all leftover mixed ink in tin foil packets and have had them last multiple years and still be usable.

Some inks (and left over ink packets) might not be at the perfect viscosity for your project, and it is really easy to adjust them by adding in more Safewash Oil. I have yet to have to thicken my inks up from this brand, but it is possible. 

This is for the transparent extender 75ml tube.