This Formula Guide is for all pastel and neon oil based letterpress inks. Guide represents coated and uncoated paper. For specialty print jobs where the color is crucial, we suggest not hand mixing pastel inks to the pastel guide. For accuracy, it is best to get a custom mix of a pastel ink mixed by the Van Son professionals. It’s challenging to control the mix of 1 part of one color to 90 parts of another.