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Preheat the oven to 300°. Line the bottoms of two 9-by-13-inch
baking pans with parchment paper. In a large saucepan, melt the
butter with the unsweetened chocolate over low heat, stirring
frequently, until melted. In a large bowl, whisk the sugar with the
eggs, vanilla and salt. Add the melted chocolate and whisk until
smooth. Add the flour and whisk until incorporated. Stir in 5 ounces
of each of the chopped chocolates. Spread the batter in the
prepared pans.
Place the remaining chopped chocolates separately in 3 small
microwave-safe bowls and melt. Using a spoon, drizzle the melted
chocolates over the batter. Using a table knife, make swirls in the
batter for a marbled effect. Bake the brownies for about 35
minutes, rotating the pans halfway through, until the tops are shiny
and the brownies are set.
Transfer the brownies to a wire rack to cool completely before
cutting into squares.
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