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How to make black icing
Buy or make your icing.
Unless your heart is set on vanilla, go with a chocolate icing. Starting with a brown-colored icing means you have to use less dye to achieve a black hue.

Available options: [+] You can buy flavored icing at an arts and crafts store or online. Choose a buttercream-based icing if you want a truly black icing.. [+] If the icing is dark, it means it has absorbed into the icing and you would use less of it. To dye a simple tin cake, you'll need about a teaspoon of icing for each hour you're making the cake.. [+] If you want to, use powdered sweetener to conceal the chlorine and chemicals that degrade and produce black icing. Powdered sweetener also lowers dye, which may lead to a lower color.. [+] You can still start with a white icing, but you will probably have to add flavoring later to cover the bitterness of the dye. You can dye most icing--including buttercream, cream cheese, or royal icing--black by following these instructions..
You can still start with a white icing, but you will probably have to add flavoring later to cover the bitterness of the dye. You can dye most icing--including buttercream, cream cheese, or royal icing--black by following these instructions.