Merlex colors are in the form of [Strength] P-[Number] [-1] or [-2] or [-3]. For instance, 1-1/2 P-27-1 should be entered as Strength: 1.5; P-: 27-1. If Color Cost is Standard, then that color is standard pricing. If Color Cost is Premium, Tier I, II, III, or IV, then it is extra cost per sack. Check with your dealer to find out exact pricing. Premium colors are on our color chart, always in stock, and range from 1.0-3.6 pounds; Tier I are custom and generally range from 1.0-1.5 pounds; Tier II are custom from 1.5-2.0 pounds; Tier III are custom from 2.0-4.0 pounds, and Tier IV are custom 4.0 pounds and up. Merlex does not charge extra for custom colors. Note that colors that include green and blue pigments are more expensive than others. Always use the correct Base with each color. If the Merlex Color App gives you any Base other than "A,B, or C", then call the Merlex office at (714) 637-1700 for more information.