knife that squirts blood

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knife that squirts blood

Postby Ed Wood » Jun 4th, '09, 20:06



Hello all, hope you've all been keeping well since my last visit.
I'm after something that may very well not exist but I'm sure one of you very knowledgable ladies and gentlemen will be able to set me straight.
I need some sort of knife that is partially examinable that when run across flesh, i.e. an arm, will appear to cut and leave a trail of blood. It doesn't require any knife through arm like gimmick, by this I mean I do not need it to appear to actually go into the arm. My only requirement is that a trail of blood is left. Basically what I need is a knife that works in the same way as needle through arm, you know, with the thing that squeezes out the stuff through the little you know what. If there was one one of those little you know whats at the end of the knife that the stuff comes out it would be perfect......does this make sense to anyone??
So, does anything of this nature exist?
Cheers, Ed

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Postby madvillainy » Jun 4th, '09, 20:15

Joke shop?

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Postby Part-Timer » Jun 4th, '09, 20:32

You can get one that is not really examinable quite cheaply (the gimmick basically comprises a strip of sponge along one side). Just do a Google search for bleeding knife (there's a Carry On joke in there somewhere).

The sort of thing you are really after definitely exists, but is usually found in theatre companies and film productions. They must get them from somewhere, but I suspect that they wouldn't really bear examination, because of how they must work. See the DIY bit here: http://www.blue-room.org.uk/index.php?showtopic=9328

Perhaps this would do instead? http://www.blackhart.co.uk/page55.html

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Postby TonyB » Jun 5th, '09, 00:02

Use an ordinary knife. let it be examined. Take out a clean cloth to polish the knife. But the clean cloth conceals a sponge with strong red die. The rest is obvious.
Or use an ordinary knife and a nail-writer with a red felt-tip inserted instead of the pencil lead.

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Postby Lenoir » Jun 5th, '09, 00:11

"I want to do magic...but I don't want to be referred to as a magician." - A layman chatting to me about magic.
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Postby Craig Browning » Jun 5th, '09, 03:52

One of the easiest ways to do this is an A/B chemical; the blade had one solution on it that will create blood red "cut" on the part of the hand that has been treated with the other solution... unless those doing the inspecting have the B chemical on their hands, no one will be any the wiser.

You can make a switch up which isn't all that difficult.

I'm not positive, but you may check with Blackhart about his straight razor... it may fit your needs.

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Postby the Curator » Jun 5th, '09, 06:58

Glue a segment of a hypodermic needle to a small rubber squeezer (à la needle thru the arm, the lenght of the needle depends the lenght of the blade). Fill the rubber squeezer with fake blood.
Glue the gimmick to a magnet. Stick the magnet to the blade. Squeeze the gimmick, then palm it. (If you can do it properly, you may also show both side of the blade using a paddle move.)
The blade is fully examinable.
Don't forget to say thanks... :D

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Postby Ed Wood » Jun 5th, '09, 09:50

Thanks all, this gives me plenty to think about.


Glue a segment of a hypodermic needle to a small rubber squeezer (à la needle thru the arm, the lenght of the needle depends the lenght of the blade). Fill the rubber squeezer with fake blood.
Glue the gimmick to a magnet. Stick the magnet to the blade. Squeeze the gimmick, then palm it. (If you can do it properly, you may also show both side of the blade using a paddle move.)
The blade is fully examinable.
Don't forget to say thanks...


This is (sort of) the method I have been working with up to now. My problem with it is that I end up having to hold the knife in a quite unnatural way when cutting but, thankyou :D

One of the easiest ways to do this is an A/B chemical; the blade had one solution on it that will create blood red "cut" on the part of the hand that has been treated with the other solution... unless those doing the inspecting have the B chemical on their hands, no one will be any the wiser.


I have considered using chemicals and originally dismissed them as I am doing this on a spectators arm. Reading your post though has made me think and I might give them another go, thankyou.

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Postby Lenoir » Jun 5th, '09, 09:57

i re-iterate, the Zoran Horror Cutter is brilliant.

"I want to do magic...but I don't want to be referred to as a magician." - A layman chatting to me about magic.
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Postby Craig Browning » Jun 5th, '09, 16:47

:shock: I want one!

After seeing the footage I've gotta have it!

http://www.youtube.com/watch?v=iip_Tc1YL80

http://www.youtube.com/watch?v=WzKdFPjGBYo

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Postby the Curator » Jun 5th, '09, 19:24

ed crawford wrote:
This is (sort of) the method I have been working with up to now. My problem with it is that I end up having to hold the knife in a quite unnatural way when cutting but, thankyou :D


I use this method for years with a medium size hunting knife. My thumb makes the squeeze and the needle is long enough. You may also use a flat full metal knife (a bit like a throwing knife), in this case the squeezer is located under your thumb on the handle.

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Postby dat8962 » Jun 5th, '09, 23:46

Take a look at Trevor Duffy's magic blood which is based on the Famous Lawrence Ginsberg's two part recipe.

Both parts are are clear liquid but when added together they instantly form blood.

There's a routine included that involves a knife.

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It's not really an optical illusion - it just looks like one!
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Postby IAIN » Jun 5th, '09, 23:57

why not a real knife, and someone you just dont like?

do NOT get Nice Cut...whatever you do...

the blackhart razor will do the job, but overly examined may allow a vaguely clever person to backtrack...

howabout, rubber cement, some red ink and clingfilm?

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Postby black hart » Jun 8th, '09, 20:38

'Slasher' will do exactly as you require. It is simple to operate and can be used on an audience member if you wish. Forget chemicals and sponges they are all way to complicated - keep it simple.

Buy 'Slasher' ( http://www.blackhart.co.uk/page55.html) at £18.00 and you get a supply of blood AND if you don't like it you can have your money back!

Keith Hart

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Postby lozey » Jun 9th, '09, 00:29

Thanks for the recomendation Mr Blackhart, it sounds just like something that im after :twisted: :twisted: :twisted: :twisted:

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