Edge play is dangerous; do not try this at home!
Knifeplay is generally a form of fear play, sensation play and light medical play if it involves making scratches and abrasions, though generally speaking knifeplay does not involve branding or cutting unless it is explicitly discussed as part of negotiations.
Knifeplay often involves moving a blade across sensitive portions of the skin, threatening safety with a knife, clothing removal with a knife and minor scratches and abrasions that might result from light pressing the blade to the skin.
- Discuss if knives are a psychological trigger, or if touching a specific area with a knife is a psychological trigger, or if menacing with a knife is a psychological trigger.
- Discuss if either possesses any Bloodborne Pathogens or STIs.
- Discuss if the scene is intended to incorporate advanced techniques such as cold, heat, fire, electricity, cutting, branding, scarification and similar.
- Equipment is cleaned, sanitized and laid out in a safe manner so that it won't accidentally cut or impale someone during an accidental fall.
- The concept and title of edge play is derived specifically from the idea that knives are sharp and very dangerous; respect the power and danger of the blade. Be sure you have practiced your control to a point where you are comfortable placing a knife on and running it along your own sensitive bits long before you ever place a knife on the skin of another. Actual knife play is even more dangerous than this because your partner may move, jump or sneeze unexpectedly and you are required to react without notice for their safety.
- If this is the first time the bottom has experienced knife play, test their reactions with the blindfold and bondage technique before utilizing a sharp edge on their skin.
After you have completed negotiations consider experimenting with some techniques after having practicing them on your own.
- Threatening Whisper knife play is mostly about fear play. Get inside the head of the bottom by utilizing threatening words, language and movements (albeit highly controlled movements). Help them experience the fear by giving them a fantasy environment in which they can reasonably feel fear. Avoid being predictable.
- Butterfly Flourish the butterfly flourish is a technique utilizing a butterfly knife in which the knife is brandished and flipped open in a flashy and potentially intimidating manner if coupled with a predatory grin and piercing gaze. 
- Blindfold and bondage This is a bait and switch technique done for safety. Place your partner in secure bondage that helps prevent them from wiggling much such as being firmly wrapped in several places to a table, pole or back board. Show them the knife so that they are aware of what is about to be done to them and then place a blindfold on the partner.
Without the partner's awareness change the sharp blade for either the dull side of a blade, a chilled metal dull blade or an electrified metal dull blade.
Utilize the new tool and run it across the skin of the bottom utilizing any psychological word play you may have prepared, often a well placed "Don't Move" whispered in the ear is effective. This will test the reaction to the "knife" to see if they jump or squirm in fear while thinking they are in danger. In the case that they do jump or squirm they will not be sliced open and will be relatively safe because of the use of the dull implement. At worst in most cases they might have a dull pain from a poke of the tip of the object, which is far better than a trip to the emergency room.
When you are comfortable you may change out the tool for the knife blade to operate on your partner. You may or may not decide to show them that you faked them out with the dull tool depending on what you'd like to achieve.
- One sided blade As part of the blindfold and bondage technique, simply flip a one sided knife over to the dull side and drag this along the skin of the bottom. It will feel similar to a blade edge but not be as sharp. This technique has the advantage of being able to be easily switched back and forth between sharp and dull.
- Chilled metal This techniqe requires freezing the blade in advance and may include the use of a glove to ensure you don't freezer burn your hand. The effect can be done to any metal object to make the edge feel sharper, meaning you can make a butterknife or letter opener feel as if it is as sharp as a blade. Further, if once the blade starts to warm after a short period, you can quietly dip it into an ice bucket to regain some chill and then run it across the skin again, pressing slightly harder. This will make the tiny water droplets running down the skin potentially feel like blood running from a cut without ever having to break the skin. See also mindfuck.
- Electrified Metal
Like the chilled metal technique, electrifying a dull object like a butterfly knife or letter opener with violet wand techniques will make the dull metal feel much sharper, almost like it is flaying their skin, depending on the setting. Be sure to understand all knife and electro safety before attempting this fusion technique.
- Electrified Blade if electricity makes a blade feel sharper, using a real knife or machete edge in conjunction with a violent wand can be a very intense experience. Be sure to understand all knife and electro safety before attempting this fusion technique.
- Heated Blade heating a blade in a candle fire or similar can cause a hot blade, use a cheap knife you don't mind replacing for this technique that doesn't have a coating on it that will melt off. Be sure to test the knife on your own skin before applying to a bottom, much like testing the heat of a baby bottle before giving it to a baby to ensure they aren't injured. Blades that are overheated can permanently brand, especially on sensitive skin. Be sure to understand all knife and fire safety before attempting this fusion technique.
- Pyro Blade Utilizing dripping wands techniques one can light the blade itself on fire for a brief moment by dripping lit alcohol onto the knife edges. Be sure to test the knife on your own skin before applying to a bottom, much like testing the heat of a baby bottle before giving it to a baby to ensure they aren't injured. Blades that are overheated can permanently brand, especially on sensitive skin. Be sure to understand all knife and fire safety before attempting this fusion technique. This technique is best done without a blidfold so the bottom can see the impressive stunt.
Unless you are incorporating various dangerous elements like cutting, branding, fire or electricity, knife play is mostly psychological and fear based. Attempt to capitalize on the intention of the scene by imagining and fantasizing a scenario in which you are truly afraid of the knife.