TA-ND-3-PRW 3" x 1000' Non-Detectable Reclaimed/Recycled Water Purple Tape. Warning Tape is made of resilient polyethylene for long lasting durability. Warning tape is color coded according to American Public Works Association standards. Graphics and Lettering are permanently protected from soil acids and alkalis. This item is weather resistant and able to withstands temperatures from -94°F to 200°F.