Diameter of a bloodstain produced by a single drop of blood of a constant volume is a function of distance fallen and surface texture. The objective of this exercise is to determine the relationship between the distance a single drop of blood of a constant volume falls and the diameter of the resultant bloodstains on various horizontal surfaces. Equipment required A few drops of synthetic blood Cardboard target surface Fabric target surface Glass target surface Glass pipette or dropper Graph papers Plumb line Tape measure Tissues Digital Camera/Cell phone will work USB Microscope/Good magnifying class will work Procedure Place the cardboard, fabric, and glass on the floor. You will use these three materials as target surfaces for this experiment. Draw well- synthetic blood into the pipette or dropper, and wipe off the excess blood on the tip of the pipette with a tissue. Squeeze the initial drop onto tissue to remove any air bubbles. Using the plumb line for centering and a tape measure for accurate distances, allow a drop of blood to fall onto the target surfaces at the heights 3, 6, 9, 12, 18, 24, 36, 48, 72, and 96 inches. Mark each target for proper identification. When the bloodstains have dried, take photographs of the bloodstains, view under magnification, and measure the diameters with a ruler. Record the results on the worksheet provided. Plot the diameters of the bloodstain on the cardboard, fabric, and glass targets vs. the total distance fallen on a graph paper. On the x-axis, plot the height; and on the y-axis, plot the diameter.