Chocolate Mirror Glaze (Glacage)

chocolate, white or dark (24.5 ounces)

water (14 ounces, 1 3/4 cups)

sugar (21 ounces, 2 2/3 cups)

condensed milk (14 ounces, 1 3/4 cups)

vanilla extract

powdered gelatin (yes, it's quite a large amount)