M1 Measurement, defined by the ISO 13655 standard, has become the industry-standard method for measuring papers containing Optical Brightening Agents (OBAs) by including the UV light component that simulates D50 conditions. This technique accurately records Fluorescence and ensures the resulting L∗a∗b∗ values reflect the color appearance under standard viewing conditions.

M1 data is vital for color profile generation and validation. It ensures your color management system accounts for the total color effect, including OBAs, instead of ignoring fluorescence. This is essential for achieving consistent color matching during the print run, regardless of the OBA level in the paper used.