Flint Raises Prices on Spot-Color Inks, Varnishes and Pressroom Chemistry: Flint Group North America has announced an 8-percent price increase on spot-color inks and overprint varnishes used in sheetfed and heatset applications. In addition, it is instituting price increases of $0.75 to $1.25 on press washes used in sheeted and offset web applications, effective April 1.