Graphic Sciences Inc., Portland, OR, has announced a price increase of 8 percent for its commercial ink and coating products.      The increase, effective Nov. 1, 2007, comes in response to rising costs resulting from well publicized changes in Chinese export trade policy, coupled with record price levels within the petrochemical business sector.      On July 1, the Chinese government eliminated its Value Added Tax (VAT) refunds to Chinese exporters, which has impacted many domestic industr...