Introduction: Slime

Picture of Slime

There are many recipes around for ways of making slime, lots based on PVA glue. This recipe is however a bit different, and is very similar to the commercially available slime toys.

There are many other recipes for making goo, both on Instructables and other places on the web as well as commercial products, so why use this one?

You enjoy making things and you will probably learn something new whilst making this
The cost will be significantly cheaper than buying a commercial product
You have full control of the properties of the goo- from runny to thick, clear to opaque and colourless to vivid colours
You can happily make large quantities of goo- even filling a bath or paddling pool becomes practical (think how many tubs of toy shop slime you’d need to this, or how much PVA glue)
The materials are easy to store- you can easily keep some on hand for rainy day play, or next Halloween
The gunk is a bit sticky- it therefore has a much better feel, and visual appeal than some commercial products (like Gellibaff), that simply run off.
The materials are biodegradable, and hence easy to dispose of
Most importantly- it’s more fun than buying it!

Whilst the materials on this page that are not known to have any significant health risks associated with them, they cannot all be classed as completely hazard free.

The largest single issue is the slipperiness of the mix- it can be very easy to slip over on. It is therefore essential to consider this when planning any activities involving slime, including clean up and washing off as the most significant effects will be found on a smooth surface such as a bath!

The materials are relatively fine powders, and as such create nuisance dust. It is therefore worth wearing a dust mask if handling large quantities. Likewise if this dust gets into eyes it can cause irritation.

Guar gum is not hazardous when eaten, however it can be used as a laxative, so it would probably be unwise to consume large quantities.

Borax (Sodium Tetraborate) is not safe for consumption, and should therefore be handled and used carefully so as to avoid ingestion, although in the quantities actually present in slime it should not cause any concern.

It is worth noting that whilst some other recipes found on the internet claim to be borax free, this isn't always the case. those recipes that use laundry starch have borax in the starch.

In addition to the specific information above, general safe chemical handling practice will further reduce the risk of any issues, in particular;
Store materials in sealed, well marked, containers in an area out of reach of children and pets
Wash thoroughly before and after handling these materials
Dispose of excess/ used materials/ empty packaging responsibly
Clean up any spills quickly- Avoid using water to stop the area becoming slippery
Do not use utensils/ containers/ cleaning cloths that will be later used for food
Supervise children whilst making or using the slime

In these instructions the quantities I give will make 1 litre of stringy slime. Quantities can therefore be easily adjusted to suit smaller or larger batches to suit your needs.

Step 1:

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Gather the materials together. You will need;

Guar Gum- This is available from health food shops.
Borax (sodium tetraborate)- Can be found in supermarkets as a water softener with laundry items. Check it doesn’t have anything else added to it.
Glycerine- available from chemists or the baking/ cake decorating aisle of the supermarket
Colouring- food colour, poster or powder paint
Suitable container to mix in
Wooden spoon, whisk or similar

Measure out the following quantities of materials. I use plastic cups to do this, but a piece of folded paper will work as well. Quantities do not have to be precise, but it may help you make a batch the same in the future if you can be fairly accurate.
The water can go into the mixing container straight away.

Guar Gum 10 grams (1%)
Borax 10 grams (1%)
Glycerine 10 grams (1%)
HOT water 1 litre

Step 2:

Picture of

Add the glycerine to the water- you may need to swirl the container you used to measure the glycerine out with water.

Add your chosen colouring, dependent on what effect you want. Food colouring will give a transparent slime, the paints will make the slime opaque. I’d recommend around 20g of poster or powder paint for a reasonable colour (2%) although I have used up to 5% for some uses. Stir thoroughly.

Add the guar gum to the water and stir thoroughly. Once it has fully dispersed it is sensible to leave the mix to stand for at least 1/2 hour. Leaving to stand will make sure that the guar gum has fully gelled, and will avoid the finished slime being lumpy. I have found a hand food mixer works effectively in giving a well mixed concoction.

Step 3:

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Whilst waiting for the mix to thicken, add 10 grams of borax to approx 100ml of hot water and stir thoroughly. If it doesn't fully dissolve, add some extra water.

When you the guar mix has been standing for long enough, start mixing in the borax. This should be added in small quantities (approx 5 ml at a time) using a small spoon or similar. Stir the borax into the guar mix.

The slime will start forming- once it has started to noticeably thicken and string, it is worth then continuing the mixing by hand. Keep adding and mixing borax until you are happy with your slime.

Note- it is not possible to dry mix the ingredients and just add to the water as the Guar won't hydrate properly if you do.

Step 4:

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Play away to your hearts content!. This slime will keep for a while, but should ideally be stored in a sealed container.

Changes to the strength of the guar mix and to the amount of borax will alter the properties of the slime from liquid and stringy to rubbery. Combine this with changes to the colouring and you have a a wide range of slimes for different uses from kids to play with to drool for your alien movie..


BoondaPhD (author)2017-11-21

Borax is bad for you but this is great

zaria_roberts24 made it! (author)2017-06-05


XOIIO (author)2011-02-17

Anyone read that goosebumbs bood monster blood?

this is totally it.

kitty cat 107 (author)XOIIO2017-05-28


kbubel (author)kitty cat 1072017-06-01

I'm reading a book right now

giant duck (author)XOIIO2012-07-24

yeah im a big fan of goosebumps

NinjaSloth (author)XOIIO2011-03-06

that's awesome anyone else remembers that!

XOIIO (author)NinjaSloth2011-03-08

Man, that was an awesome book! I actually have a copy lying around.

You know what another neat old series was? Animorphs. I used to read that like crack

mwuchevich (author)XOIIO2012-01-25

have the whole set.. in a child hood box.. then was everworld.. not her finest...

TheSweetRevenge (author)XOIIO2011-02-24


Goosebumps were like, my childhood. This stuff is awesome XD

rainingfiction (author)2017-03-28

EWWWWWW love it!


Ana2282 (author)2017-03-23

I don't got any of those things.

hwhwhwhhw (author)2016-12-08

How do I make slime without glue?

superpants (author)hwhwhwhhw2016-12-09

Just follow this instructable- no glue here!

_twaby_ (author)2016-08-31

i ordered it

SamS230 (author)2016-04-16

I'd love to try this but I don't have access to borax so I tried making slime without borax --

fmallari made it! (author)2015-08-29

I love it

locoblondie (author)2015-04-07


RedMamaD (author)2014-10-23

If you use food coloring, will it stain hands or clothing? I am sure it might when you are making it but when it has become a polymer will it stain?

superpants (author)RedMamaD2015-03-19

Food colouring can stain, but it is very dependent on the type and quantity- If you are concerned, use the minimum that will give the colour.

Coolloom (author)2015-03-12

Nice! i only thought its is found in shops but now i know how to make it

superpants (author)Coolloom2015-03-19

Thanks- Have fun!

Kevin hardy (author)2014-02-14

sorry thats not safety

superpants (author)Kevin hardy2014-02-14

Perhaps you could elaborate any particular issue you have to help others?

hattrick58 (author)2014-01-18

When I went to university, our fraternity pulled a prank and filled the deans pool with slime. It took us over a week to make enough to fill the pool.

huangjianboy (author)2014-01-17

Does the feeling just like touching Oobleck?

superpants (author)huangjianboy2014-01-18

It's similar- why not try making both and comparing?

Viali Jones (author)2014-01-15

Can you fill a bathtub with it and run on it…? ;)

superpants (author)Viali Jones2014-01-16

You could fill a bathtub with it- most I have ever made in one batch was 60l- that was a lot of slime!

mk2001 (author)2014-01-15

I did something like this when I went to Brock university on a field trip

superpants (author)mk20012014-01-16

Cool- Now you can try it at home!

cupcake lover (author)2013-06-25

I have a question. Is the slime bouncy? Because the one I made was really bounvy

superpants (author)cupcake lover2013-06-26

This type isn't bouncy I'm afraid- To make it bounce you are best to use the PVA & Borax type.

friendlysinger (author)2012-03-22

Cool instructable! I'm totally gonna try this!

Thanks- Have fun!

Chakolate (author)2011-06-24

Which way makes it thicker? Do you use more borax or less? More guar gum or less?

superpants (author)Chakolate2011-06-27

Increasing either the guar gum and borax will make it thicker- I would however recommend making up a set concentration of the Guar Gum and adding more borax as the best way to start

MoritzB (author)2011-02-23

Borax is dangerous, isn´t it?

superpants (author)MoritzB2011-02-23

Borax is not without it's hazards and various material safety data sheet give differing advice.

If handled appropriately, as I have detailed in the instructions, and importantly not eaten there should be no cause for alarm.

As with any product, do not eat, place in the eyes, and if there is any sign of skin sensitivity wash immediately.

When the slime is made, the borax is used to cross link the guar gum- it is therefore chemically bound into the slime. The hazards are therefore primarily related to the preperation of the slime.

Chakolate (author)superpants2011-06-24

Borax used to be used as a food preservative, and was only discontinued after years of consumption proved harmful to some people. So you'd have to say it's not good to consume it, but it's not exactly Public Enemy #1. IOW, it's relatively safe.

dwadhwa (author)2011-06-05

I saw on youtube that we can make slime easily.u just need-
1.elmers glue

superpants (author)dwadhwa2011-06-06

You can use glue to make slime, but this method offers some advantages- primarily it is cheaper!

jcksparr0w (author)2011-03-29

1% of a liter is a centiliter or 2 teaspoons

fireburnin (author)2011-02-27

slime is awesome to play with but i have never made it cause i don't have all the right stuff

kyayokh (author)2011-02-20

is it wet?
just asking because i used 'kanji' powder ( i dont know it name in english) to mike slime and it make my hand wet

superpants (author)kyayokh2011-02-21

It will be wet, but not excessively so. How wet will depend on how much borax you add- the thicker the slime, the less wet it will tend to be

crazybot_99 (author)2011-02-18

wow it is cool, i tried it on my stupid sis!

chicopluma (author)crazybot_992011-02-19


my photo (author)2011-02-12

thats just sparkeley play dogh midxed with a hole bunch of diffrint stuff

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