I have never used a pen and ink. I use a paint brush and a pencil.
if your talking about writing utensils: a pencil
You should not use ink because it will move and separate into multiple components making it confusing to interpret the results. Pencil will not move, therefore is recommended to use a pencil.
Instead of pen or pencil, they use ink and feather or charcoal.
A lead pencil can be used to lightly mark chromatography paper to help identify and track samples during the process. However, it is important not to press too hard or use ink as it may interfere with the chromatography separation.
depends on how you use it and if you know how to tattoo people sometimes if you leave thick ink there it will hurt the person and it will soak in too deep. i would prefer using thicker ink for shading in dark spots for example the eyes and nose of a skull and then thinner ink to make it look more like a pencil shading :)
E ink is better than regular ink because E ink can be used electronically. E ink, since it is used electronically, doesn't require actual ink for a person to use it.
bronze, watercolour, ink, blue pencil, wax resist.
Easy shading and it's erasable unlike paint or ink which would be permanent. so if you mess up with anything besides a pencil, you have to start over.
By using a piece of paper, a pen and maybe some ink a pencil too
Because the ink from the pen will run and smear during the chromatography but the pencil mark is not affected.
You shouldn't use a dried out ink cartrige for anything but trash. It is better to just buy another.