"Black Magic" is an entertaining bit of Shaw Bros. craziness about witchcraft and breast milk.
The plot, as is often the case with Hongkongese flicks, feels like it was made up while the movie was made. For example, it concerns a battle between a good and a bad magician, but the good magician isn't introduced until the end of the movie. Wouldn't it have made sense to establish him as a good guy earlier on?
Characters also come and go without rhyme or reason. You get used to seeing certain people and expect they'll stick around, but oftentimes, they don't.
However, if you're a fan of weird Asian movies - and there are no weirder movies than those from Asia - you'll probably think that that adds to the film's bizarre, off the wall charm, which it has in spades.
The plot concerns several people visiting an evil magician in Malaysia to produce love potions and occasionally, to have people killed. These potions require hair torn from the person's head, and sometimes also breast milk taken straight from the source. I read some rubbish online about this movie being softcore, but that is ridiculous. There's no sex, and the only nudity shows a bare breast while the milk is extracted.
Anyway, assorted people visit the bad magician to get potions and put curses on each other, until the good magician is introduced and they have a fight in a construction yard.
Apparently (according to Wikipedia) the bad magician fell in love himself with one of the girls, but I don't remember that.
The movie is really just a collection of nifty set pieces involving black magic and its supernatural effects on people. There's not enough of a plot to string parts of the movie together, so I felt my attention waning. Either way, there's enough weirdness to please fans of Asian cult flicks, and the movie is generally entertaining.