Wet sieving
Definition
The process of washing material through a mesh with water to separate and recover small fragments. Preferred for fire debris that has compacted or that contains ash aggregates masking small bone pieces.
- Primary use
- Recovering small bone fragments, teeth, bullets, and personal effects from excavation fill and fire debris
- Key advantage
- Separates compacted material and ash aggregates that hide small fragments in dry sieving
- Applications
- Clandestine grave excavation and fire-scene archaeology
Common questions
Why use water when sieving excavation material instead of just shaking it dry?+
Water helps separate compacted soil and debris that sticks together in dry sieving. Small fragments like bone pieces, teeth, and bullet fragments can get trapped in clumps of material and pass through undetected unless you wash them free with water.
What types of evidence does wet-sieving help recover?+
The method recovers small material that dry sieving misses: bone fragments, teeth, bullet fragments, and personal effects. It is especially valuable in fire scenes where ash aggregates can mask small bone pieces.
Is wet-sieving used in clandestine grave work?+
Yes. During grave excavation, material from the fill is washed through a sieve with water to recover small remains and artifacts that would otherwise be lost. This is a standard part of systematic burial site recovery.
Related terms
- Burn deposit stratigraphy
- The layered sequence of ash, charcoal, collapsed structural elements, and debris produced by a fire, recording the temporal order of combustion events...
- Calcined bone
- Bone heated to above approximately 700°C, resulting in complete combustion of the organic component (collagen), leaving only mineral hydroxyapatite; characterised by white...
- Flotation
- Passing grave fill through water to separate organic material that floats (seeds, plant fragments, insect remains, charcoal) from heavier inorganic material that...
- Half-sectioning
- Dividing the grave along its long axis and excavating one half as a section face before opening the other half. Provides a...
- In-situ recovery
- The documentation and removal of evidence from its original position before any surrounding material is shifted. Requires that position, orientation, and associations...
- Peri-mortem burning
- Burning that occurred at or very close to the time of death, while green (fresh) bone still contains its organic matrix. Distinguished...
- Pugilistic posture
- The post-mortem flexion of the limbs and clenching of the hands caused by heat-induced differential contraction of flexor muscles. It indicates exposure...
- Seat of the fire
- The point of ignition or the area of maximum burn intensity, identified by fire investigators from char patterns, spalling, and burning vectors....
- Sequential pedestal method
- An excavation technique where the grave fill is removed in spits around the body, leaving the remains elevated on undisturbed matrix until...
- Taphonomy
- The systematic modification of bone by environmental processes after death, operating over the burial or exposure interval. Includes weathering, soil staining, sun...
Explained in these topics
- Clandestine Grave ExcavationWashing fill through a sieve with water to recover small material that would pass through a dry sieve, including small bone fragments, teeth, bullet fragments,...
- Fire-Scene ArchaeologyThe process of washing material through a mesh with water to separate and recover small fragments. Preferred for fire debris that has compacted or that contain...