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Preheat oven to 325°.
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Grease 12 cup bundt pan with shortening and set aside.
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In a stand mixer, cream together butter and sugar for 8-10 minutes.
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Add in eggs 1 at a time, beating in between.
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Add in flour, salt, orange zest while beating.
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Add in food coloring. I used red and yellow liquid food coloring and followed the proportions on the box, it was 14:1 yellow to red. My cake came out much lighter than I thought it would. You might want to double the food coloring.
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Remove from stand mixer and gently fold in the orange soda.
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Pour the batter into the prepared bundt pan, do not fill more than 2/3 full because this cake rises a lot due to the carbonation.
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Bake for 1 hour to 1 hour 15 minutes, until toothpick comes out clean.
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Remove from oven. Cool in pan 20 minutes.
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Turn out onto wire rack and allow to finish cooling.