Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Mixing Dental Stone in a Bag Store dental stone n resealable plast c bags. An 8- by 12- nch resealable plast c bag can store two pounds of dental stone powder. W th premeasured bags, cast ng mpress ons at the cr me scene nvolves only add ng water. The bag conta n ng the dental stone powder can be used to m x and pour the dental stone. To make a cast, add the appropr ate amount of water to the bag and close the top. M x the cast ng mater al by v gorously massag ng t through the bag for 3–5 m nutes. Ensure that the mater al n the corners of the bag s also m xed. After t has been m xed, the mater al should have the cons stency of pancake batter or heavy cream. Mixing Dental Stone in a Bucket or Bowl If the mpress ons are numerous or large, t may be necessary to m x larger quant t es of dental stone n a bucket or bowl. The dental stone should be added slowly to the water and st rred cont nuously for 3–5 m nutes. After t has been m xed, the mater al should have the cons stency of pancake batter or heavy cream. Pouring Dental Stone Casting material has sufficient weight and volume to erode and destroy deta l f t s poured d rectly on top of the mpress on. The cast ng mater al 126
Handbook of Forens c Serv ces 2007 should be poured on the ground next to the impression, allowing it to flow into the impression. The impression should be filled with casting material until it has overflowed. If the mixture does not flow easily into all areas of the impression, use a finger or a small stick on the surface to cause the dental stone to flow into the impression. Do not put the stick or finger more than 1/4 nch below the surface of the cast ng mater al because t can damage the mpress on. Before the cast hardens completely, wr te the date, collector’s n t als, and other dent fy ng nformat on on t. In warm weather, the cast should be left und sturbed for at least 20–30 m nutes. In cold weather, the cast should be left und sturbed longer. Casts have been destroyed or damaged when l fted too soon. If the cast s n sand or loose so l, t should l ft eas ly. Casts n mud or clay may requ re careful treatment and excavat on when be ng removed. Allow the cast to a r-dry for at least 48 hours. Package the cast n paper, not n plast c. An FBI Laboratory exam ner must clean the cast. Lifting Two-Dimensional Impressions L ft ng an mpress on allows for the transfer of a 127
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