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Caught With a Kiss Lab. Caught by a Kiss Lab: Post Lab. Why is starch agar used? -To see if saliva was present and broke down the starch. Positive control –used to show what the change looks like Negative control – used to what no change looks like
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Caught by a Kiss Lab: Post Lab Why is starch agar used? -To see if saliva was present and broke down the starch. Positive control –used to show what the change looks like Negative control – used to what no change looks like Controls used to ensure the experiment is working! Why is this test done at the crime scene?
What should the data have looked like? The white areas show Where saliva was present. Blue black areas show No saliva was present.