Writing with milk on paper will be invisible (or nearly so) , Heating the paper will scorch the milk first and make it visible.
The way invisible ink works depends on the method used to make it.
if its milk you heat it
Co is an element in invisible ink. Co was names for German evil mining spirit. Co element was used to make magnetic mines in WWII.
what part of the water cycle have invisible ink involved
There are references to it all the way back to the 1200's. I know the US government just released top secret papers from WW1 and included in this was directions to spies how to make invisible ink and how to find documents with invisible ink. Considering this was written in 1911 it is a eye opener.
You can use water at room temperature.
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).
The hypothesis of an invisible ink could be that the ink will become visible when exposed to a certain type of light or heat, based on the properties of the ink's chemical composition.
Invisible Ink - 2011 was released on: USA: 2011 (video premiere)
Invisible Ink - 1921 was released on: USA: 3 December 1921
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.
Yes. Equal parts of baking soda and water can be used as invisible ink which will become visible under heat, or when covered in grape juice.