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Which of the tubes to the right is a positive test for starch and which is a negative?

Which of the tubes to the right is a positive test for starch and which is a negative?
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Which of the tubes to the right is a positive test for starch and which is a negative?

User Lucas Matos
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Corn starch was used for the positive control and distilled water was used for the negative control. Compare your tube to the following image of the positive and negative controls.
User Linus Odenring
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