Presentation on theme: "足迹 FOOTPRINT. 2D- once the print is photographed it can be lifted with a gel lifter, shoe impression lifters or fingerprint tape. When using fingerprint."— Presentation transcript:
2D- once the print is photographed it can be lifted with a gel lifter, shoe impression lifters or fingerprint tape. When using fingerprint tape the impression will have to be lifted in the same manner as a multi finger lift.
Enhancing 2-D prints The 2D print can sometimes be “ developed ” in much the same way as a fingerprint by using black powder. The print can then be lifted and placed on acetate or white paper.
Sketching draw a diagram or sketch of the impression noting anything unique about.
Equipment needed: 1 gallon zip-loc bag or a plastic bucket 2 to 3 pounds of dental stone or plaster of Paris 6 to 9 ounces of water. Mix to a “ pancake ” dough consistency. Casting
Before pouring the mixture the impression needs to be prepared: If the impression is in a “sugar” sand or powdery medium the soil or medium will have to be “fixed”. Use a pump type bottle of hair spray and lightly coat the impression to fix it. Also remove any excess debris (leaves,twigs etc.).
After the casting begins to dry “ scratch ” in all pertinent information. After about 30 minutes place a knife about 1 inch to one side and under the casting. Gently lift the casting free from the soil. Once the casting is removed it should be placed in a box or bag. Do not put it in plastic. It will continue to “ cure ” for several days. Excess dirt can be removed after 24 hours.