Use of a colouring agent in approved dips as an aid in identifying dipped sheep
Murphy, T.M.; Geraghty, V.M.; O'Brien, D.J.; O'Sullivan, D.
Veterinary Record 118(7): 171-173
1986
ISSN/ISBN: 0042-4900 PMID: 3962127 Document Number: 270386
A fat-soluble dye was a suitable colourant for mixing with approved dips during the statutory winter dipping period. The optimum concentration of the dye was 0.4%. It uniformly dyed the sheep and, depending on the breed, persisted on the fleece for 3-6 months. Any dye that remained on the wool at shearing (6-8 months after dipping) was washed out with scouring solutions containing non-ionic and anionic detergents. The dye did not alter the efficacy of commonly used insecticides.