1. Begin with the Intended Use
Establish the governing principle: select the prop according to what the actor will actually do with it.
- Display only — worn, carried, drawn, or shown
- Noncontact action — handled dynamically or used in a threat, but never brought into contact with another performer or weapon
- Contact choreography — used for parries, blocks, disarms, or other controlled contact
A prop suitable for one purpose may be entirely unsuitable for another.
2. Purpose-Made Prop Knives
Briefly compare the principal choices:
- Steel — convincing weight and appearance; appropriate construction required for contact
- Aluminum — lighter and easier to handle, but may bend, nick, or look insubstantial
- Rubber — useful for close bodily contact, falls, and some disarms; excessive flexibility can look false; unrealistic sound when dropped.
- Plastic or resin — lightweight and often visually convincing, but generally unsuitable for contact because it may crack or fracture; unrealistic sound when dropped.
3. Converting a Real Knife
- Conversion is appropriate only for a sound, fixed-blade knife of suitable construction.
- Remove the cutting edge completely.
- Round and blunt the point generously.
- Remove burrs, sharp corners, and decorative projections.
- Preserve enough blade width and thickness for structural strength.
- A converted knife is still a rigid metal object and must not be treated as harmless.
4. What Makes a Knife Fight-Worthy
Concentrate on qualities considered during selection and preparation:
- Secure blade and handle
- Adequate tang construction
- Sufficient blade thickness and stiffness
- Smooth, broad edge
- Rounded point
- No sharp guard, pommel, or handle fittings
- Enough size and visibility for the audience
- Appropriate weight and balance for the choreography
5. Matching Display and Fighting Props
- A visually accurate “hero” knife may be used for close viewing or display.
- A safer duplicate may replace it when bodily or weapon contact begins.
- The two props should match closely enough in size, shape, color, and finish that the substitution is not apparent.
- The change must be carefully rehearsed and controlled.
6. Final Practical Rule
Close with the essential conclusion:
- Choose the least hazardous prop that will accomplish the theatrical purpose.
- Appearance alone does not determine suitability.
- Preparation cannot make every knife appropriate for contact choreography.
- The fight director or other qualified person should approve both the prop and its intended use.