Bright Dyes FLT Yellow/Green products are specially formulated versions of Xanthene dye. They are safe, non-toxic, biodegradable, and certified by NSF International to ANSI/NSF Standard 60 for use in drinking water.

Bright Dyes Yellow/Green products are a traditional fluorescent water tracing and leak detection material and has been used for labeling studies from the beginning of the century.  It may be detected visually, by UV light and by appropriate fluoremetric equipment. Today, it is most often used visually.