As long as you don't wet the spot with the ink with any water.
Invisible ink typically lasts for a few hours to a few days before it becomes visible, depending on the type of ink used and the conditions it is exposed to.
When the nib stops wetting the paper.
i can not write on plain paper and then come to come ink is over.
Writing with milk on paper will be invisible (or nearly so) , Heating the paper will scorch the milk first and make it visible.
When you use your secret pen and there are no words showing up on the paper that means your out of ink.
just use the milk. write on the paper then let ir dry. When the ink is dry you take a lamp and if you shine light on the paper the ink will become visible
Invisible ink isn't actually invisible. The writing done with invisible ink is invisible, and can be read only after applying certain treatments. For example, orange and lemon juices are invisible inks. Orange and lemon juices are perfectly visible, but when you write with them, the text becomes invisible. The text can be read only if the paper is kept under ultraviolet light, or if it is slightly heated.
To make an invisible ink, one can use any acidic juice such as lemon, orange, or apple. This can be used to fill in a pen and carry it everywhere and anywhere. The invisible ink can be used to write on any paper. When paper is placed under candlelight, the secret message will be revealed.
There is more than one kind of invisible ink, but some of the simpler varieties can be revealed by heat. This can be done with a candle - but carefully, since you don't want the paper to catch on fire.
Lemon juice works as invisible ink because it is acidic and weakens the paper fibers, making the writing invisible until heat is applied. When the paper is heated, the sugars in the lemon juice caramelize and turn brown, revealing the hidden message.
Yes, baking soda can be mixed with water to create invisible ink. When the solution dries on paper, the writing becomes invisible and can later be revealed by applying heat or a second solution (such as vinegar).
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.