Spray dye shows where you've sprayed with dissipating blue color.
Concentrated spray dye solupaks temporarily turn spray solution a blue color to mark where you have sprayed. Spray dye eliminates waste due to overlapping and indicates drift. The spray dye dissipates in 2 to 72 hours depending on sunlight. Mixes with all liquid sprays. Use one solupak for 50 gallons. 12 solupaks per carton.
2015 Master Catalog: Page 327