I don't think they were taken aback by the color, more like the sound feel and smell of the glove.
It had to have been the smell them because all 3 calm and then it was like "what the hell?"... as they backed away before I even touched them. Okie funny. The other ok after they checked it out. I held out an apple treat in my palm to him. He didn't want to but he come got it and then kind of nudged my hand away like take it off but he was ok after a few minutes. I just thought it was interesting that 3 horses acted the same.