ISO 4630-2-2004 for transparent liquids - Color assessment using the Gardner scale - Part 2: Spectrophotometric method, spectrophotometry - Specifies a method for assessing the Color of transparent liquids using the Gardner scale. The standard describes in detail the technical requirements and operating procedures for measurement using a spectrophotometer to ensure that the Color of transparent liquids can be accurately and reliably compared to the Gardner scale. The standard also specifies the method for calculating the color difference and its correspondence to the Gardner scale to ensure the conformity and repeatability of the assessment results. Color control is widely used in food, cosmetics, chemicals and other industries, especially in areas requiring accurate Color matching and mass evaluation. Through a standardized color evaluation process, this standard helps to improve the mass management and market competitiveness of transparent liquid products.