Kohl & Madden, a member of the Sun Chemical group of companies, announced price increases of 4 percent to 8 percent on its commercial printing inks effective Jan. 1, according to Brad Bergey, president, Kohl & Madden.      Due to the current imbalance in the supply and demand of many of the raw materials used in the formulation of printing inks and varnishes, Kohl & Madden has had to accept multiple price increases over the last months while also dealing with shortages and allocat...