many years ago i asked a mate of mine who was an experienced painter to spray a vespa for me in candy gold over black explaining i wanted the paint to flip form black to gold, seems fair right ?
he painted the base black and then started on the candy gold...and it turned brown...metallic brown but brown nonetheless. i questioned my friend on this turn to the turd side colourwise and he said of course that would happen, didn't i know anything ? i explained to him that i had asked for a certain look and he had not told me this is what i would get. his reply was that i could stop at one coat of gold and it would stay dark brown but the more gold he put over it the less brown it would get, so we used all the gold and , guess what, it still looked like a sparkly turd
luckily i wrote it off 3 days after putting it back together so i never had to look at it again ( and 2 months of left leg in plaster from toes to testes was a small price to pay i thought)