Sarah+bloodstain+analysis+lab

Exercise 1 1) no color change not blood 2) no color change not blood 3) no color change not blood 4) turned pink blood 5) no color change not blood

Exercise 2 1) no color change not blood 2) no color change not blood 3) no color change not blood 4) turned green blood 5) turned green blood

For your lab report you will need to turn in a paper with: (This should be typed)

1. Title, Date, Your name and the name of your partners 2. The names of your lab partners 3. Observations from each part of the lab

observations of agar: there are lines between HA and the HS and on the other third of the agar, the line formed between the ?S and HA, so therefore, the ?S has to be human serum, therefore it is a human blood source 4. Answers to the following questions:

__Questions__ 1. Recall: what is a presumptive test?

2. What are the advantages of using a presumptive test as opposed to a more complicated test. Which parts of your lab are considered presumptive testing?

3. After the sample is confirmed to be blood, what is the next major step in the testing sequence? Which part(s) of your lab relates to this step?

4. Some of you got positive results for several of the samples using the Kastle-Meyer Color Test. Our luminol test showed that there was only one true blood sample. Explain why you may have gotten positive results for samples that were not in fact blood.

5. In Exercise 4, what is the source of the unknown? How do you know?

6. What was the purpose of using blue and yellow food coloring?