u/Double-Bug9678

Years ago as a kid, I saw this movie briefly on TV and it gave me the heebs, but I cannot find it and neither can chat gpt.

I remember it looking technicolor, something Vincent pricey looking (price may have actually been in it). I remember the costumes looked medieval or renaissance. There was a castle, and one of the central plot points is - people who have been infected with some sort of evil can be revealed by looking at their reflection in a mirror. In which case, they look like very colourful witches cackling away in the mirror.

Anyone know what this movie is?