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.