I had no idea it could be done. Anyone else done it? No me, at least not nylon. The recipe is one large pot of at least two gal. Bring to boil before adding halters. Add a bottle of RIT dye, not the powder and stir well, moving and lifting the halters. Boil for 10 min with a little stirring and lifting, then allow to cool and rinse well. This is very drying on leather so it should be removed. Hang to dry and you now have nice looking halters again. Dark halters should be re-dyed with dark colors and the lighter one need to go a little darker. There is no lightening the colors.
If any one has done this a few pics would be nice.