If you don't have arrowroot starch, there are several substitutes you can use:
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Cornstarch: Cornstarch is the most common substitute for arrowroot starch. It has similar thickening properties and can be used in the same ratio as arrowroot starch.
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Potato starch: Potato starch is another good substitute for arrowroot starch. It has a similar consistency and thickening power and can be used in the same ratio as arrowroot starch.
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Tapioca starch: Tapioca starch can also be used as a substitute for arrowroot starch. It has similar thickening properties and can be used in the same ratio as arrowroot starch.
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Rice flour: Rice flour can be used as a substitute for arrowroot starch, but it has less thickening power. You may need to use a little more rice flour than arrowroot starch to achieve the desired consistency.
When substituting any of these starches for arrowroot starch, keep in mind that the end result may have a slightly different texture or flavor.