Because soya based inks are less expensive to use very few newspapers will spoend the money to purchase the old metallic, petroleum based inks today, if they can find them, because of the affect on the bottom line, the profit that newspaper needs to make to justify its existance. If a business manager of a newspaper, in todays cost cutting arena, atill insisted on purchasing the old type of ink he/she probably would not be employed very long. While it is good to be concerned know that it is not very likely for a newspaper to use inks that might be toxic to your garden.

the days of using metallic inks on newspapers are long gone...I wouldn't worry about it. For fun, call the newspaper and ask them what kind of ink is used for printing.