The ink contains heavy metals which can cause cancer as stated below:
“Exposure to a class of organic chemicals called arylamines, such as benzidine, 2-Naphthylamine and 4-Aminobiphenyl, is associated with high risks of bladder and lung cancer. Apart from these, printing inks also contain colorants, pigments, binders, additives and photo-initiators (used for speeding up the drying process of the ink), which have harmful effects.
There are literally thousands of ink chemicals and a majority of them can be dangerous for consumers. Newspapers are usually produced by a system called offset-web printing, which requires a certain consistency of the ink (it needs to be very thick) and a particular means of drying. For the former, mineral oils (petroleum-based) and solvents such as methanol, benzene and toluene are used; and for the latter, heavy metal (Cobalt)-based drying agents are used.”
I don’t mean to scare you but it also contain Dioxin which is one of the most toxic chemical on earth. It should be noted that some newspaper ink are made from vegetable based which is a lot safer but still poses risks.