The pH Colour Chart (Polyart) is a large, durable, and visually clear educational chart designed to display the standard pH scale and corresponding color changes of universal indicators. Printed on high-quality Polyart synthetic paper, it is waterproof, tearresistant, and suitable for long-term use in laboratories and classrooms. The chart vividly illustrates the pH range from 0 to 14, showing the transition of colors from strong acids to strong alkalis.