The Excalibur ColorPRO system is a precise, simple to use color matching sytem that produces simulated Pantone colors using 11 ink colors (including black and white). ColorPRO is a Pantone licensed system which means you will produce the most exact colors which can be easily repeated. All of the colors have been mixed and test printed on T-shirt fabrics. ColorPRO plastisol ink has excellent opacity and is suitable for printing on both light and dark fabrics.Formulations are based on weight and are extremely easy to follow. Simply select a color from your Pantone Color Formula Guide and find the formula in the ColorPRO Mixing Guide. You need to mix only the quantity that the job requires.