3D life casting is a process of creating a detailed three-dimensional sculpture or replica of a person's body or body parts, such as hands, face, or torso. It's done by making a mold directly from the person's body using materials like alginate, silicone, or plaster.

Common materials include alginate, silicone, and plaster. The choice of material depends on factors like the level of detail and the desired durability of the final cast.

When performed by a trained and experienced professional, 3D life casting is generally safe. The materials used are skin-safe, but it's important to follow safety guidelines and take precautions to ensure the comfort of the subject.

The duration varies depending on the complexity of the project and the body part being cast. It can range from 30 minutes for a hand casting to several hours for a full torso casting.

Follow any specific instructions provided by the artist, wear suitable clothing, and be prepared for the molding material to come in contact with your skin.

The process is generally safe for people of all ages and health conditions, but it's essential to communicate any allergies, sensitivities, or health concerns with the artist beforehand.