The present invention concerns a secure document (1) comprising at least a personalized rainbow color micro-text (10) with a text height inferior or equal to 300μm. The invention also concerns the method of production of said secure document (1). The present invention also concerns a method of production of a secure document (1) comprising at least a personalized rainbow color micro-text (10) with a text height inferior or equal to 300 μm, said method comprising at least the following steps: - printing a rainbow color pattern on a predefined area (110) of the secure document (1), - laser marking on the rainbow pattern of the predefined area (110), in order to form the personalized rainbow color micro-text (10) on said predefined area (110). The laser marking can be laser blackening, laser whitening or a laser color change.