- Practices and equipment used in color-grading maple syrup were evaluated. A significant difference was discovered between the traditional visual method of color matching and the measurement of light transmission by spectrophotometer, a method that is new to the U.S. maple industry. A method to correct differences in grading between the two methods was determined and proposed. We also evaluated visual comparison kits that are widely used in syrup grading and identified potential sources of errors in their use. A workshop on grading methods has been developed and offered to producers as a way to improve their knowledge and skills.