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Melt the two chocolates and the butter together in a double boiler.
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Let the mixture cool to room temperature.
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Mix the eggs, sugar, salt and vanilla together until well blended, but do not whip.
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Whipping to a foam creates more leavening and results in a crumbly brownie.
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If the eggs are not at room temperature, stir the mixture over a hot bath just until the mixture is at a slightly warm room temperature.
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Blend in the chocolate mix.
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Sift the flour and fold in.
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Pour into a 9" x 13" pan.
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Bake at 325 degrees F for 45-50 minutes.