Because the dyes in ink are sparingly soluble in water, as they are organic dues. The solvent used in ink is Acetone (Propanone). to make them 'Combine' you would need to use an acetone solvent. However, due to its toxicity and combustibility i don't recommend it.
I hate when people ask questions and there is no answer. I need to complete my chemistry homework!
soluble
not soluble but can be converted into an acid soluble salt
Soluble
Biro ink and chlorophyll are soluble in methylated spirits
Sand is not soluble in ink.
It is soluble, but it depends on what liquid you are talking about. Some are soluble in water, others in alcohol.
Both the pen and the ink are usually not water soluble
A soluble substance is a substance that can dissolve in another substance.
Chromatography
there is a product called GLACIERWASH
Most office and art supply stores sell this ink. One brand you could look for is India ink.
Are you asking why ink spreads and paper doesn't when water is spilled on a page? Ink is water soluble so it dissolves and spreads. Paper is not water soluble (although it will get soggy) so it doesn't dissolve.
It is entirely dependent upon solubility. First, the individual dyes that make up the ink's final color must be soluble. Then, the dyes that are more soluble are able to stay dissolved in the water longer than those that are less soluble, therefore getting further up the paper.
Try a paper towel moistened with rubbing alcohol; many inks are soluble in alcohol.
Rubbing alcohol works as a solvent on ink stains because it has polar molecule. Ink also has polar molecule so the like items dissolve each other.