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There are 2 techniques for facial reconstruction (more often referred to as "facial approximation"): 2D and 3D. In the 3D method, the artist sculpts over a replica of the skull, either by using a 3D micron scanner, or with traditional casting materials.

Tissue depth markers are attached to the replica for the thickness of the muscles, skin and fat. These are not absolute thicknesses; they are only guidelines as usually the weight of the person is not known. The artist will then use soft oil-based clay to sculpt the features and flesh onto the replica, taking into account the facial structure, age, etc, of the unidentified.

In the 2D method, photographs of the skull with the tissue depth markers attached are taken, and the artist will use transparent vellum and a light table to draw over the skull image. This method is used when the skull is too fragile to be replicated using casting materials. The artist should NEVER sculpt over the actual skull, as it could be easily damaged this way. Also, the artist needs to have the real skull next to them as a reference when sculpting.

The reason why these are now called "approximations" is because forensic artists can only give approximation of what a person looked like. The term reconstruction implies that the person's actual face is being replicated, and the science community simply doesn't have enough information to be able to determine this.

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Q: How facial reconstructions are made using a skull?
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How facial reconstructions made using a skull?

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