Instructables
Picture of Using gelatin for moulds and prosthetics
After my 'ible regarding using alginate as a mould making material, there were lots of questions about materials and obtaining them. Here's another method that uses only items that are readily available.

Gelatin is a much disregarded product when it comes to the home user.
It is safe to use and has some fantastic properties, it can be cast, or used to make moulds, it is re-usable (you just melt it back down) and best of all it's cheap and easy to get hold of.
It's safe (you can obviously eat it), but it's not just for cooking!

There are plenty of on-line tutorials on gelatin preparation for SFX, but they all call for some exotic ingredients. This 'ible uses only off the shelf stuff, but it works perfectly well.

You can store the prepared gelatin in the freezer for months, so make up a few batches and store them for future use.

In this Instructable we will prepare two types of gelatin mix, and look at their uses.


 
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Step 1: The basic mix

Picture of The basic mix
We will need the following materials:

Gelatin, you want the crystal or powder type, not the sheets. This is available in the bakery section of your supermarket. Gelatin is an extract of beef so it's a natural product. It is used to 'set' various foods. Most notably Jelly (Jello), but it is found in lots of recipes. I use 'Dr Oetker', only because it's sold in Tescos.

Glycerine is a pure form of liquid syrup. Found at the drug store or pharmacy. Often used to sweeten kids medicines.

Liquid honey, or 'runny' honey. The stuff in a squeezy bottle will do fine.

Warm water, a plastic jug, some plastic cups, some stirring sticks (from the coffee shop), a small electric whisk. some washing up liquid, and access to a microwave oven

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SGTCMadison19 hours ago

Can you use Vegetable Glycerine for this?

W.H9 days ago

Everyone here is smarter than me. You said "fill one small cup" and show a picture of a 2- cup vessel with some crystals in the bottom. Please tell me what size the "small" vessel should be. Nothing about your ratios make sense so far. What about starting with an envelope of Knox gelatine? Thanks. Bill

gonadgranny1 month ago

Hi. May i ask what function the honey and they glycerine fulfil please?

Hey! This isn't my instructable but I've used this recipe before (substituting the glycerin for corn syrup, though). They both help to thicken the mixture and make it waaaaay stronger. If you just use water and gelatin (4:3 ratio) you will get a good prosthetic but not great quality and it will tear and fall apart fairily easily.

Hey Chloe. Thanks very much for the reply. I always like to know why I am doing what I am doing! Due to honey being rather expensive, would one be able to substitute it entirely with glycerine? I would imagine that the colour comes from the honey too but that can easily be replicated.

W.H gonadgranny11 days ago

Glycerine is not a replacement for honey and it's not even close. Honey is mostly a sugar mixture and getting closer to honey would be molasses and corn syrup which are also sugar mixtures.

ColtD...don't skip the honey. If you can't get honey, you still need a sugar mixture..at least get some corn syrup. You could probably make something useful with table sugar, but you'd have to experiment. Glycerine is not a replacement for sugar syrups like honey or corn syrup.

ChloeD W.H10 days ago

Next time I get the chance I am definitely going to experiment a bit. I'm not sure but I do think its might be possible to just to use glycerine (I know it's possible to just use corn syrup, water, and gelatin). I love findign out what wroks and whta doesn't!

I'm thinking that it would work. I haven't tried it quite yet but I will eventually. If you do, you might want to use slightly less water, from my experience honey is less runny than glycerine or my personal preference of corn syrup.

ColtD14 days ago

I tried doing this using a lot of videos on Youtube, and I can't figure out what I'm doing wrong. My mixture won't solidify enough. My mix is pretty gritty but its as good as I could get it. I didn't use honey, but what I'm using is GreatValue flavored gelatin with Humco glycerin (skin care product? I think) its driving me crazy I really want this to work. I tried more gelatin than glycerin but that didn't solve it. I want to use this to make molds for small items like rings and coins. Any help here?

hey, first of all thanks to providing such a simple and cheap method!

I've got one question - is it necessary to use a microwave? or can i also heat it up in a pot on the stove?

hello can i use this for make figures of sugar paste??? it is safe with foods?

My questions are:

1. I am trying to make this "jelly" as a jelly in a mould for the show Oliver.. how long will it last and any hints on how much to use?

2.Does it need to be refrigerated after each show?

BTW I added cochineal colouring to the mix and it looks great :)

Parawax1 year ago
@ rmagnificent:

Not sure if marshon will be responding. If you don't mind, I may be able to help. First off, I want to tell you that I am no expert. I've just been learning as I go. So you may want to confirm any statement I give if it doesn't sound right to you. 1. Honey. I believe he uses the honey because it gives the gelatin a translucent appearance and color that more closely resembles natural skin. 2. I've tried using liquid latex on my masks in the past and I've had problems around my mouth, eyes, and neck, where the most movement occurs. I now use Pro's-Aide or medical adhesive. It works great, but that stuff REALLY sticks to your skin. If you use it, definitely get the remover that goes along with the particular adhesive you're using. Also, these adhesives don't allow much time (if any) to adjust after you apply the prosthetic. When you stick it, it's there. I prefer Pro's-Aide cause I just apply it and pretty much forget it for the rest of the night. Hope this helps.

Sorry it's taken me a year to thank you for the advice. I fell off the face of the planet for a little while there, haha.

I tried Pro's-Aide, and holy moley! What a difference. Thank you so much for the suggestion, I'll never have to deal with Spirit Gum ever again! I see what you mean about getting the remover though, this stuff is no joke.

Thank again for the advice, I really do appreciate it, even if it takes me a year to say so. Happy creating! <3

CementTruck3 months ago

I cand breed lookig at dah pitchuh

ChinaDang10 months ago

I love that you put this up. So let me thank you for that first. I just wanted to know if it were possible to add some flesh colors to any of the mixtures instead of applying it to the prosthetic. If so, how would you go about doing it?

thomas966611 months ago
just made a block there with this recipe. Many thanks, I'd previously tried a recipe from a prosthetic makeup artist's website and it was carp compared to this, well done. Only thing is, I think I made foamed gelatin without a blender since I started with everything in the bowl... Might follow your instructions next time and see what happens ;) Keep up the good work, and I want to see that prosthetic in use!!
agraham191 year ago
I have seen this recipe before but with a food colour instead of the honey. What's the benefit of using the honey please?
kturnbull31 year ago
When using the plasticine will the plaster pick up more details sculpts as the 'ible uses a pretty simple design?
Cool
Hello! First I'd like to say great instructable, and thank you for showing us this versatile technique. I actually have two questions for you.

1. You mentioned using honey in the gelatin recipe? I've made gelatin before simply using glycerin, water, and raw gelatin. Is honey a super awesome ingredient I've been missing? What does it do in the formula?

2. As far as adhering the gel (for a face prosthetic) is it possible to use liquid latex? Sometimes, for whatever reason my bod doesn't react well to spirit-gum.

Thank you so much, and happy crafting!
This is great, children who want to play various roles can get their moms to make them various masks or body parts and then use face painting techniques to liven them up with face painting tools for Sydney from http://www.serendipi.com.au Thanks for the cool tips.
I will be looking around, but do you happen to have a link to any good instructables on making a custom cast of a face or body part? I am wanting to make MANY different prosthetics, and while I have the knowledge and experience to tweak where I need to I have not yet attempted custom casting.
ldb4772 years ago
Question... if I wanted to use this technique to mold a gelatin hand, could I use the gelatin cast and pour new gelatin in? Or would I have to fill it with something else first (like plaster), then cast that in plaster, then finally use the plaster cast to pour in the gelatin. That probably sounded confusing, but let me know, thanks!
marshon (author)  ldb4772 years ago
I'm not completely sure what it is you are asking me. You cannot make a skin cast using hot liquid gelatin. Essentially it's toffee and would result in third degree burns.

To make a gelatin hand, you would need to make the master mould from Alginate and plaster, then cast your gelatin in that.
kinshi2 years ago
NICE POST!!
Question: do the blending edges curl up like foam latex? does the gelatin require powdering to prevent curling?
marshon (author)  kinshi2 years ago
Glue right up to and past the edges then powder the join. I've not had my gelatin (or foam) cast curl excessively.
venefica2 years ago
Hi there again!

Do you apply something special on the piece before of after colouring it? Everything I tried on gelatin prosthetics (powder, RMGP, foundation, etc.) tends to smear.

Thanks a lot for this wonderful instructables!
marshon (author)  venefica2 years ago
I always talc my casts first. This helps to reduce tack and helps the make up 'stick' a bit better.
THISISSOAWSOME!!!!!
venefica2 years ago
Hi Marshon!

I tried both stuff and had excellent results with the basic mix, but I can't make thin edges with the foamed stuff even after having warmed the molds up, which helped a lot with the basic mixture. Have any clue for me?
moca le2 years ago

woooooooooooooooow !!
lvegetables2 years ago
i have had some issues with this step.
at first i was using a plaster life cast, with a clay prosthetic, and cooking spray as the release agent. unfortunately the plaster (having not been sealed) absorbed the release agent and all was lost..

did another life cast and tried again, this time sealing the plaster and applying a release agent... and the plaster came off but it was cracked and un-usable. i was able to save the clay prosthetic..

so i realized that i haven't been making the clay fence or making the plaster thick enough.. and i shall try again!!!
mccathryn2 years ago
excellent work
Heeeey Marshon =)
Greetings from Uruguay.
I cannot beleave i found that page yet.
Your 'able is amazing, thanks for share.
Im excited with this, i've bought today
Sorbitol (5L), distilled water (5L), Pure Glycerine (5L)
and 500 grs of Gelatina Oro (Gelatin Gold) :\
But the package dont say nothing about bloom.
Can you tell me in what places can i buy 300 bloom Gelatin?
Thanks =)
...
Hello :)
Well, i can´t wait ... i had bought gelatina food grade ...
I got the basic mix ready, but im having problems to find
places to buy "spirit gum" or similar, but i have "teeth glue"
this work fine i hope.
And problems to find fiberglass head :(
But have another question.
I have mustach and beard what about melt the mix and
put it directly on my face and other body parts?
Its hard to remove later?
Thx Marshon!
...
Aaaaafffff sorry Marshon
If put the basic mix direct on my skin what type of non-toxic paint
can i use to try to change the colour of this to matches with my skin colour
(when the basic mix is liquid yet)
Thx !!!
marshon (author)  sickmushroom3 years ago
You cannot put the liquid straight onto your skin, it must be cast first. Use ordinary make up, or face / body paint to colour it. This is all in the 'ible. You need to read it first.
...
Yep, i did it (read the 'able).
Just something hard to understand (for the language).
Thx for all =)
marshon (author)  sickmushroom3 years ago
NEVER EVER put the liquid mix on your skin!! READ the 'ible. It's red hot toffee and you WILL GET SEVERE BURNS!!!
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