FT175-28 Fluorescent Water Additive Tracer Dye (4 oz. Bottle)This tracer is a concentrated (immediately miscible) liquid dye, operating in the fluorescent mode and viewable with a black light (L-105-400). Developed for water systems study, this tracer is ideal for leak testing large systems or pipelines. Biodegradable, and can be diluted up to one ounce per 1000 gallons. (ASTM 188.8.131.52 & ASTM 184.108.40.206 Visibility Enhancers). Available in 4 oz, gallon, 5-gallon and 55-gallon packages (Call 1-800-288-3647 for larger sizes).