Blue Signal Spray Dye in EZ Solupaks shows where you've sprayed with dissipating blue color
Concentrated Blue Signal 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 hrs. depending on sunlight. Mixes with all liquid sprays. Use one solupak for 50 gal. 12 solupaks per carton.
2016 Master Catalog: Page 327