Picture of Blood, the chemical way!
Well well, well. It's Halloween. What would Halloween be like without blood effects? As much as I may despise this "holiday" it is Always fun to MAKE something awesome for a costume or just something to scare the crap out of anyone. I mean, that's what it's all about right? (or is it massive sugar rushes...?)

So we get onto the instructable itself.

Now, before I go any further, we are dealing with CHEMICALS. Yes, that's right, CHEMICALS! they may be awesome, but as a disclaimer (though these are not volatile, nor caustic) I take NO responsibility for your stupidity. One of the chemicals is a TOXIN hazard. AKA don't drink it, it's not good for you. Also, the final blood product is kind of like medical iodine, it WILL stain, and takes a fair amount of washing to get the color out of your skin. No burns, but toxic, and stains. Act accordingly.

This might also not be something smart for children under 10. Stick with red cool-ade.

That said, let's have fun! This can be used for special FX in movies and not only Halloween! For hair raising blood effects, I've never seen anything like this! It's so crazy close to REAL blood that you'll have your neighbors dropping their mouths and dialing the local hospital for an ambulance!

Even better, this requires no pumps (heart included, we're not actually cutting ourselves)

So what DO we need?

Step 1: Materials

Picture of Materials
Here's what you need.

Potassium Thiocyanate
Ferric Nitrate
Two plastic spoons
stirring rods (can be spoons)
shot glass
two containers to put your two part blood in. Should be easy to seal, and easy to carry.
Paint brush (optional, but recommended)
dull something to "cut" yourself with

Don't know where to get the chemicals? look here:
potassium thiocyanate:

Ferric nitrate:

30g lasts a LONG time, and makes one heck of a lot of blood. Maximum you'll ever need is two bottles of each... unless you intend to bathe in the stuff... (see stupidity disclaimer)
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easyfabric1 year ago
its seems kind of unnecessary to use chemicals when there are many other ways to make fake blood
eviltechie7 years ago
This is so cool. This could be used as a great effect in theatre. I heard cyanate. Is'nt that related to cynide.
thecheatscalc (author)  eviltechie7 years ago
I'm not sure actually, but...

Cyanide is (C≡N)
cyanate is (O=C=N) or (O-C≡N)

So yes, I guess they would be related. Cyanate just has an Oxygen thrown in.
That little oxygen is a significant factor though.
From Carbon monoxide to carbon dioxide is a major difference.

One kills you, one doesn't
one is only present in insignificant amounts naturally, one is the very reason why our world runs.
zimmemic254 years ago
Hi, I'd like to ask if there's another way to get this effect, because the problem I see is the potassium thiocyanate (the uncolored solution) is (at leas in EU) rated as "toxic when in contact with skin" (don't know the exact translation, original in germany is "R 21 Gesundheitsschädlich bei Berührung mit der Haut")... and that's the solution you paint on your skin…
navik4 years ago
does anyone know where to Potassium Thiocyanate and Ferric nitrate from because www.hometrainingtools.com dont sell it anymore.
hoppe_groda5 years ago
OMG! You are a freaking genius! :D
weesuzi5 years ago
http://cartwright.chem.ox.ac.uk/hsci/chemicals/potassium_thiocyanate.html Hmmm It is harmful so you are taking a bit of a risk with this stuff, check out the safety data sheet above
Can you ummm... repeat the first two materials in English?
I believe he did ;)
I ment in terms I can understand (sorry for stupidity ^_^ )
actually no those are the names of the chemicals. you know how chemicals always have long name :P
ilovegm5 years ago

Fake blood: [Fe(H20)5.SCN]^2+

Its an aqueous complex solution and thus watery, you can always try to thicken it with stuff like corn syrup.

You may "lol", but that's actually a very useful comment. I was thinking it looked rather watery.
krisking936 years ago
what if the fluids gets dry will it still work
I don't think u would have it on that long. :)
Sniper725 years ago
The two components create a "chemical" blood, My question is does the "chemical" blood have a similar viscosity of that actual blood?
szechuan537 years ago
yay, unconscious mom!
PKTraceur6 years ago
Aweosme! Probably not something I'd show off though. -PKT
maruawe6 years ago
When mixing chemicals you always turn the two chemicals into another chemical. What is the mixture called after mixing. and what is the possibility of the combined mix being toxic when dumped esp. washed down the sink where you have just cleaned with bleach or borax
Berkin6 years ago
This is pretty awesome.

It would be better, though, if you could not see the skin underneath the red in places. Because then it just looks like there is mysterious red liquid appearing, and no cut.

It would be a great improvement if you found something that could blacken the skin and make the blood, so it looks like an actual cut.
John Smith7 years ago
OK, let me start off by saying that this is awesome, and looks extremely cool. Anyway, here's the health part of the MSDS for Potassium Thio-whatever:

Potential Health Effects

Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath.
May cause psychosis, vomiting, disorientation, weakness, low blood pressure, convulsions and death which may be delayed. The probable lethal dose is between 15-30 grams.
Skin Contact:
Causes irritation to skin. Symptoms include redness, itching, and pain.
Eye Contact:
Causes irritation, redness, and pain.
Chronic Exposure:
Prolonged or repeated skin exposure may cause dermatitis. Repeated ingestion of small amounts may cause weakness, confusion, central nervous system effects, nausea and skin eruptions.
Aggravation of Pre-existing Conditions:
No information found.
Skin Contact:: Causes irritation to skin, Symtoms include redness, itching and pain. This does not make me overconfident in slapping this on my skin. Any chance you could clarify this for me? Are these effects only "potential"?
these will probably only happen if you have an allergic reaction. if for some reason you want those symptoms, sprinkle on some powdered sodium. it also adds a flame.
(ps, don't do this)
I'm not sure, I just copied it from the MSDS. I think it is a potential, but I'm not sure.
Here's the info on the Ferric nitrate:

Health Rating: 1 - Slight
Flammability Rating: 0 - None
Reactivity Rating: 3 - Severe (Oxidizer)
Contact Rating: 2 - Moderate
Lab Protective Equip: GOGGLES; LAB COAT
Storage Color Code: Yellow (Reactive)

Fire Fighting Measures

Not combustible, but substance is a strong oxidizer and its heat of reaction with reducing agents or combustibles may cause ignition. Fire may produce poisonous or irritating gases.

Contact with oxidizable substances may cause extremely violent combustion. Sealed containers may rupture when heated. Sensitive to mechanical impact.

Fire Extinguishing Media:
Dry chemical, foam, carbon dioxide, or water spray.

Special Information:
Wear full protective clothing and breathing equipment for high-intensity fire or potential explosion conditions.
Explosion is supposed to be bold too.
szechuan536 years ago
just so you know, your link doesn't sell either of these anymore. however, you can still get them at american elements.
kmc5126 years ago
wow. i want to do this. right now. but my roommates are all pretty girly and i don't want to freak them out too much. well done, two thumbs up. :)
thats y you freak the out
szechuan536 years ago
will it work if the potassium thiocyanate is dry???
Would this work if you let the stuff you put on the knife dry? If so it would look a little better and you wouldn't have to hide anything from the camera.
nice, you added a "incurable diseases" section on your safety issues, that'll make the youngins stay away from anything
Thaychris7 years ago
I bet if someone did a production of Sweeney Todd, this would come quite handy.
koax7 years ago
Somebody know where can I find some in Canada? (Quebec) Because US company wont ship it in canada.... Oh and thx man for this good Instructable if i can find the 2 chemicals it will really help me whit some magic trick +1
pengyduck7 years ago
I'd love to make this, but the chemicals aren't sold anymore in those sites. It stinks that that's happening.
Shifrin7 years ago
This is one of my favorite movie effects, its easy and it is more of a low cost. Nice Instructable! +1 Rating! -Alex Shifrin
darthdredge7 years ago
both of your links go to potassium thiocyanate. this is the link i found for ferric nitrate at that website:
Ferric Nitrate
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