Worst recorded case?
Before Black-As-Knight faded to orangish yellow (for 10 years!). After Black-As-Knight all friends noticed within 6 weeks and commented. (I was still a skeptic, although he was shiny, he still wasn’t solid black). After 2-3 months I tried to buy that beautiful black horse out there in the pasture only to be told he was my horse (honestly didn’t recognize him). After a year, Black at last (still slight fading during summer). After 2 years, Black with no fading and a triple thick tail. After 3 years, Blue Black year round. I feed triple doses during the summer as my horses are outside all day every day. Most people are quite thrilled with difference after a month. But the longer they are on it, the better the horses look.