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In large bowl, cream shortening and butter with electric mixer.
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Add vanilla. Gradually add sugar, one cup at a time, beating well on medium speed.
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Scrape sides and bottom of bowl often.
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When all sugar has been mixed in, icing will appear dry.
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Add milk and beat at medium speed until light and fluffy.
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Keep bowl covered with a damp cloth until ready to use.
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For best results, keep icing bowl in refrigerator when not in use. Refrigerated in an airtight container, this icing can be stored 2 weeks. Rewhip before using.
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NOTE: Changes in Wilton's traditional recipes have been made due to Trans Fat Free Shortening replacing Hydrogenated Shortening.