Instructables
Picture of Blood Spurting Knife Wound
Make a gory Hollywood style bloody knife wound with spine tingling results. Perfect for Halloween or film SFX.

From the Make Halloween Edition by Zack Stern



 
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Step 1: What You Need...

Picture of What You Need...
1. Knife. Pick a cleaver style knife with a decent sized blade.
2. Small diameter plastic or vinyl tubing
3. Baby medicine dropper or turkey baster
4. Hot glue
5. Dremel or grinder

Step 3: Make it...

Picture of Make it...
WP29KnifeWound_015.bmp
Put the knife in a vise or use clamps to hold it down firmly. Once secure, begin cutting the arc using the tool of your choice. I used a Dremel and was surprised that one cutting blade made the entire cut.

WARNING: Be sure to wear safety goggles and gloves.

Then using a grinder or file, flatten out ALL of the blade edges and corners. Carefully test it with your finger to make sure it is not sharp. We don't want to draw real blood.

Using hot glue, secure the tubing to the blade. You may want to test the blade on your arm for the best location of the tubing so the 'blood' squirts out at the right spot.

Step 4: Use it...

Picture of Use it...
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Make some fake blood or buy a small tube of it. There a quite a few recipes for fake blood on the internet if you want to go the hard way.

This effect works best with long sleeves. Run the end of the tube up your sleeve and down your shirt or jacket. Suck up some blood using the medicine dropper or baster and attach it to the open end of the tube. Your hollywood effect is ready to use.

Lay the knife down on your arm and slowly squeeze out the blood as you make a spine-tingling scream!

I hope you enjoyed this Halloween SFX Instructable!
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zascecs5 years ago
AAUUUGHHH!!! I forgot to cut out the arc in the knife!!!... ... (*tears) I want my arm back...
zascecs zascecs5 years ago
...Just Kidding 5 stars
LOL!!!!
ReCreate5 years ago
do you know how hard it is to cut through hardened steel? not all people have diamond-coated dremel bits
You can make a pretty realistic knife from duct tape, so there's always that.
uhh yeah, but they are $7 on ebay. a simple 2 second google search proved that.
Wow really there are diamond coated bits?
Oooh. I want one
Yeah :D
i might just make the knife part and put it on a dummies neck (my brother maybe?)
hackmattr4 years ago
 It would've been better to make the whole knife out of wood and hide the tubing in the handle. thats only if you want it to be shown on both sides.
xproplayer4 years ago
lovely pick of knives if you can cut through the whole thing with one blad roflmao
Capt. Kidd5 years ago
7@7 4 1337 kr3w
Kani575 years ago
This is very excited.
Walikai5 years ago
have fun cutting through hardened steel with a dremel ; )
I think its cool, but can't see this being used in a Halloween costume. you need to secure it to your arm. to me it also seems inconvenient, if not impossible to collect Halloween candy while holding that thing up to your arm.
isacco5 years ago
A good job and well explained instructable! In my opinion "Tech" section is not an apppropriate classification. The content is not "Tech".
XaiofDren5 years ago
Couldn't you just use a plastic knife that looks realistic? Or mod it to look realistic?
Camisado5 years ago
Just to safe some google search: Fake blood: Water+Cornstarch+Food coloring ( works for me )
LoopyMind5 years ago
Maybe it's a good idea to dull the blade with the Dremel before doing this...
Step 3, third paragraph - dull all the edges.
ah yes, but step 3 is AFTER you've put a sharp cleaver to your arm to mark the cut out part... i would dull the blade before putting it on my arm... but then again, scars like that are cool..
I think, if somebody is daft enough to cut their arm at the preparation stage, then they probably shouldn't be allowed sharp things anyway.
true true :) but there's probably a lot of them out there, more then you and i both might think :)
Lol
bounty10125 years ago
Hehehe... Nice effect
joey25426675 years ago
in the movie, you looked at a different arm then was shown. lol, anyways, cool!
timmy1234s5 years ago
it almost made me faint! Looked real.
Rockerx5 years ago
..."and now back to Cannibalistic Chefs on FOX"
moesboy Rockerx5 years ago
teehee
moesboy5 years ago
how much did this build cost?
mweston5 years ago
I enjoyed the bad jokes and cheezy facial expressions - they made my day :-)
TRIPLEC mweston5 years ago
simply, awsome
CarStalkerZ5 years ago
haha i got paint on my leg and my mom thought it was real
(removed by author or community request)
simply, awsome
steelraven5 years ago
Lol, awesome FX )
=SMART=5 years ago
Haha cool ! one question, how do you pump the blood if one arm is being cut and the other is holding the knife?
Squeeze with your armpit. he he.
Your thumb holding the knife squeezes the bulb.
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