Blood Identification

Lab Partners: Sheena Lee and Teo Kar Leng

Why do Test 3 last?

Most difficult to do (many complex procedures)

Test 2 is most commonly done (easiest to carry out)

Test 1:

Aim- To determine whether a stain is blood.

Results- 

Sample	Prediction and reason for prediction before H2O2 test	Observation (during the test)	Result (Tested +ve or –ve for catalase)
1	Yes. It’s red in colour and very thick.	No bubbles	-ve
2	No. Looks and smells like salsa sauce.	No bubbles	-ve
3	No. Looks and smells like fruit juice	No bubbles	-ve
4	Red in colour, looks and smells like blood	Bubbles (instant)	+ve
5	No, because it’s dark purple in colour	Bubbles (instant). But stopped after awhile.	+ve
6	No, because there’s specks of the sample in solution	Little bubbles formed at the bottom after awhile.	+ve