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Preheat oven to 350 degrees. Make sure all your ingredients are room temperature.
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In a separate bowl, combine flour, salt, baking powder and soda and mix.
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In your mixer fitted with the paddle attachment, blend butter, sugar and vanilla at medium speed until pale and fluffy.
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Add eggs, one at a time, scraping the bowl after each addition.
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Reduce speed to low and add a cup of flour followed by ⅓ of the buttermilk. Repeat this 3 times, until you have incorporated all the flour and buttermilk.
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Separate batter into 3 bowls, equally. Add red food coloring into 1st bowl and mix (may take a few drops depending on what brand you use).
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Repeat with blue food coloring.
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Grease two 8in cake pans.
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In the first cake pan, add ½ blue batter and spread it around the pan. I the middle of the blue batter add ½ of the white batter and spread out a bit, gently. Finally add ½ the red batter to the center of the white batter.
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Repeat with second pan.
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Bake at 350 degrees for 20 minutes or until a knife comes out clean. Cool for 10 minutes then remove from pan and allow to completely cool on a cooling rack.