Create and cast small prosthetic pieces and bald caps — City & Guilds Limited End-Point Assessment Service Industries Revision
This element focuses on the practical skills and theoretical knowledge required to design, sculpt, mould, and cast small prosthetic pieces and bald caps fo
Topic Synopsis
This element focuses on the practical skills and theoretical knowledge required to design, sculpt, mould, and cast small prosthetic pieces and bald caps for theatrical and media applications. Learners will master life-casting techniques, material selection, and safe application methods to create durable, realistic prosthetic appliances that meet production standards. The outcomes emphasise precision in detailing, colour matching, and seamless blending to achieve professional results for screen and stage.
Key Concepts & Core Principles
- Prosthetics application: Understanding how to create, apply, and remove prosthetic pieces using materials like silicone, latex, and gelatine, including colour matching and blending edges.
- Character and period make-up: Researching historical and fictional characters to create accurate and convincing looks, using techniques such as ageing, stippling, and contouring.
- Health and safety: Complying with COSHH regulations, sterilising equipment, patch testing for allergies, and maintaining a clean workspace to prevent cross-contamination.
- Client consultation and communication: Conducting thorough consultations to understand client needs, managing expectations, and documenting consent and aftercare instructions.
- Special effects make-up: Creating realistic injuries, burns, scars, and fantasy looks using techniques like bald caps, blood gels, and wound fillers.
Exam Tips & Revision Strategies
- Always document your process step-by-step with photographs and notes; this portfolio evidence demonstrates understanding and can rescue marks if a cast fails.
- Practice sculpting edges as thin as possible (feather edges) to ensure seamless blending during application; examiners look for invisible transitions.
- Conduct a material compatibility test on a small sample before committing to a full project, especially when combining silicones with other release agents or additives.
- For external assessments, rehearse time management for life-casting, as delays can cause discomfort to the model and affect the quality of the mould.
Common Misconceptions & Mistakes to Avoid
- Students often underestimate the setting time of alginate or plaster, leading to incomplete life casts or moulds.
- Insufficient release agent application causes the sculpt to stick to the mould, destroying the mould and requiring re-sculpting.
- Bald caps are frequently cast too thick at the edges, making them difficult to blend seamlessly onto the skin.
- Failing to account for material shrinkage when casting, resulting in prosthetic pieces that are undersized and do not fit the model correctly.
- Overworking silicone or gelatin during mixing introduces excessive air bubbles, compromising surface finish and transparency.
Examiner Marking Points
- Award credit for accurately taking a life cast of a model’s face or head, ensuring proper safety and comfort protocols (e.g., nostril vents, release agent).
- Demonstrate correct sculpting techniques on a positive cast, including blending edges (flash edges) and creating fine textures appropriate to the design specification.
- Select and use appropriate materials (e.g., alginate, silicone, plaster, gelatin, foam latex) with justification for their properties and suitability for the prosthetic piece or bald cap.
- Successfully create a two-part or multi-part mould that captures all sculpted details without undercuts, ensuring clean demould and minimal seam lines.
- Cast a prosthetic piece or bald cap with consistent thickness, embedded hair or reinforcement where required, and edge preparation for application.
- Maintain a professional workspace and adhere to health and safety regulations, including COSHH assessments for all materials used.