It's not exactly cheaper than buying the factory made plasticine, but its fun for a rainy afternoon so the kids can stay entertained.
My recipe is experimental, so I'll attempt to keep improving it. These measurements will give a soft textured plasticine modelling clay.
Step 1: Collect Your Ingredients
As this recipe was rather experimental - I kept adding ingredients until the texture of the plasticine seemed malleable and firm enough to sculpt.
Step 2: Melt Ingredients
1 A4 sheet 100% beeswax (100g)
6 teaspoons mineral oil (baby oil)
3 tablespoons petroleum jelly (vaseline)
2 tablespoons coconut oil / linseed oil
1/2 cup limestone powder
Place some water in the larger pot. Bring to boil.
Place the smaller pot inside.
Break beeswax into smaller pieces. Melt at medium heat.
Step 3: Add Limestone Powder and Oils
Add baby oil, coconut oil / linseed oil and petroleum jelly last 30 seconds of stirring well before turning off heat.
Quickly pour onto trays / plates lined with aluminum foil.
It will harden quickly - in around 10 minutes. Check the texture by rolling with your hands.
If the texture is too firm place modelling clay into double pots again, reheat on low and add more lime powder, petroleum jelly and mineral oil. Cool again.
TROUBLESHOOTING Texture Problems
Too crumbly - Increase the amount of wax and oils to increase stickiness and soften texture of overall mix. The mixture should become more malleable and thinly rolled sections will no longer fall to pieces.
Too firm - Add more oils and limestone powder. It should become more sticky. If the ratio of beeswax is larger compared to the other ingredients, the modelling clay will be quite firm. This is perfect for finer sculpting.
PS. Its possible to experiment with turpentine and linseed oil for softening or thickening your mixture - but away from the stove for saftey.
Watch this instructable as a 1 minute MOVIE (for visual learners who prefer watching instructables to reading them)
Step 4: Colour You Plasticine
Add tumeric for bright yellow.
In the pictures above I added 1 tablespoon of dried colour pigments to my mix
You could experiment with oil paints for colouring.
Store in an air tight container.
It's interesting to note that oil paints contain the same ingredients in this experimental plasticine recipe with the exception of whiting or lime powder (calcium carbonate).
Step 5: What You Can Do With Plasticine?
Animation, casting, stop-motion, jewelry, plasticine paint-by-numbers gifts - possibilities with plasticine are endless!
Here's a quick tip on warming a cold lump of your modelling clay easily.
1. Tear clay into small sections. Wrap in plastic wrap.
2. Place boiling water inside hot water bottle. Cover with plastic bag.
3. Place small clay pieces around plastic bag. Cover again with another plastic bag and wrap tightly with towel or other material.
4. The clay lumps will soften within 5 minutes.