Flint Ink North America has announced price increases for a variety of ink products. The increases come in response to the rising costs of raw materials, transportation, energy and environmental compliance.      Prices for all heatset ink products, including process, special, spot color, metallic, fluorescent inks and overprint varnishes, have increased by 6 percent. Color ink prices for newspaper and coldset commercial printers have also increased by 6 percent. These price increases were effe...