Jikken Slime Jelly: English Instructions, Step by Step
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Jikken Slime Jelly — jikken means “experiment” — is the Meiji kit built like a school science lesson. You do not shape anything. You mix, you pour, and the mixture runs through three visible changes in front of you: it changes colour, it foams, and then it stretches into a soda-flavour jelly you can pull like slime.
What You're Making
It changes colour
The moment the liquid meets the powder in the round well, the mixture turns pink. Nothing is wrong — that is the first stage.
It foams
Bubbles rise through it like a reaction in a beaker. This is the “experiment” part of the name.
It stretches
Once the last sachet is stirred in, the jelly turns blue and pulls out into long strands. See how far you can get it to go.
Soda
Soda flavour, no fruit juice. One pack makes one tray’s worth.
There is no heat step at all, which puts it in the same group as every other kit that needs no microwave.
Why It Changes Three Times
Most kits in this range are recipes: you follow the steps and end up with a finished sweet. This one is closer to a demonstration. The point is not the jelly at the end — it is watching each stage happen.
That also makes the order matter more than usual. Each sachet is the trigger for the next change, so adding them out of sequence, or adding the last one before the first two are properly mixed, is the main way it goes wrong.
If you already know our Kracie W Slime Jelly guide, this is the same idea done differently: that one is two slimes you make side by side, this one is a single slime that transforms in stages while you watch.
How to Make It
Want to see more? Follow @popncandy_tokyo on Instagram for more Japanese candy kits being made.
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Open the tray and lay out the sachets
There are separate sachets for each stage. Keep them in the order the pictures on the pack show — they are not interchangeable.
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Make the liquid in the long well
Powder in, water as printed on your pack, and stir until it is completely clear of lumps. It turns a pale blue-green.
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Put the next powder in the round well
Tip it in dry. Do not add water to this one directly.
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Pour the liquid onto it and stir
Use the spoon. The mixture turns pink and starts to foam — the first two changes.
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Add the last sachet and keep stirring
It turns blue and thickens. Keep going until there is no dry powder left on the surface.
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Lift it and stretch
Scoop some onto the spoon and lift slowly. The slower you pull, the further it goes. Eat it fresh — it is at its best straight away.
If It Never Stretched
Four causes, in the order they actually happen:
What to check
- The last powder was not stirred through. Dry patches of powder on top are the most common cause. Keep stirring until the surface is even, then try again.
- The sachets went in out of order. Each one triggers the next change. Check the numbered pictures on the pack before you open the next one.
- Too much water in the first well. A thin starting liquid gives a thin jelly. You cannot take water back out, so measure against the line on the tray.
- You pulled too fast. Stretching is about speed. Lift slowly and it keeps coming.
Water is behind more failures across this whole range than anything else — we wrote up why the water is almost always the problem and what to pour if your tap water is hard.
Common Questions
Does it need a microwave?
No. Water only, no microwave and no stove — here is the full list of kits like that.
Is it actually edible?
Yes — it is confectionery sold as food. Meiji declares none of the designated Japanese allergens for it; it is made in a facility that also handles cashew, walnut, wheat, egg and milk. Always check the printed pack, and see our parents’ guide for the wider range.
How is it different from W Slime Jelly?
W Slime Jelly gives you two slimes to make and combine. Jikken Slime Jelly gives you one slime that changes in stages. If your child likes the “watch it change” part more than the making part, this is the one — the W Slime Jelly guide is here.
How long does the pack keep?
It is a dry powder with a long but not unlimited life. We wrote up shelf life and storage.