Unfortunately, only to someone you like or love on Valentines day. Any legal papers, contracts, or official documents, should only be written in Black ink. Other than the fact that people buy them I really do not know why there is a red pen. Sometimes they are used to underline important words, or phrases in a letter, but Never used to write a whole letter. Unless as stated above, it's a personal letter.
No, they have no ink and the resultant penmanship is terrible.
It defends itself by blinding who ever is hunting it.
Using black and blue ink shows proffesialism, because your work will look more neat and professional when avoiding the use of colored ink. So when writing a formal letter by hand use black or blue ink.
Is it for your child? A sibling? Relative? Try just using their name, kids at the age of 4-7 are starting to write and getting better at it, so they like reading their names! So if you write a letter to them start by using colorful paper, colorful ink/crayons and make it pretty.
Yes, it does ever so slightly by the mass of the ink that is added to the page.
ball point pens have thin ink tubes then a ball when you write the ball rolls picking ink up from the tube and writing and then ink comes out when you write!
Egyptians wrote using ink on papyrus sheets. They also wrote by carving hieroglyphics into stone.
NO. Have you ever heard of Ink Poisoning?
To create a message using invisible lemon ink, you can write with lemon juice on paper and let it dry. When you want to reveal the message, gently heat the paper with a light bulb or iron to make the writing appear.
use a pen/pencil and paper or a computer with appropriate software and a printer with ink/toner and paper
black ink
to write with. So we can write but if the ink runs out you have to shake the pen.