food tests

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Last updated 9:01 AM on 5/14/26
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4 Terms

1
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starch

iodine

positive: blue / black

negative: orange / brown

2
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protein

biuret solution

positive: purple

negative: blue

3
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lipids

sudan III stain

positive: forms bright red layer

negative: no layer

OR

ethanol

positive: cloudy emulsion

negative: colourless

4
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glucose

benedict’s solution

positive: low = green medium = yellow high = red

negative: blue