The blood typing kit includes one bottle of Anti-A_serum, one bottle of Anti-B_serum, one bottle of Anti-Rh (also called Anti-D) serum, several blood typing trays with three wells each, toothpicks for mixing the liquids in the wells and several bottles of artificial blood. Each separate bottle of fake blood represents one person.
When you do the blood typing procedure you will be using only the artifical blood. Place a few drops of the artificial blood into each of the three wells in the blood typing tray. Make certain you use only blood from one single bottle (which represents one person).
Add several drops of Anti-A to the well labeled A, several drops of Anti-B to the well labeled B and several drops of Anti-Rh to the well labeled Rh. These chemicals represent antibodies to destroy their respective blood types. For example, Anti-A is the antibody to destroy A. So, if Anti-A reacts in well A with a blood sample, then that sample contains type A blood.
Use the clean end of a toothpick to stir each separate sample. Obviously if you dip a toothpick into one well and then use the same end in a different well, you are going to contaminate the samples.
Look for a change in appearance within a well. If there is a reaction (called agglutination), the appearance of the sample will change. It will start to look grainy, have a dusty-looking surface, or appear to be shot full of black pepper. All of these types of visual changes indicate a positive response. So, if you see a change in well B, then the person has type B.