This is the easiest way to make slime, and requires only cornflour and water. I usually add some food colouring to the mix too, for a bit of extra fun. Green is our favourite slime colour. I once made it red, and it stained everything it touched, including our skin, so no more red slime for us!
I used a kilogram of cornflour in each tub, and roughly the equivalent in water. I normally just add water while mixing until I get to a consistency that I like. Less water makes it firmer, more water makes it runnier. I tend to lean towards firmer to start, as inevitably, the kids want to add water to the mix at some point while playing with it. The food colouring can be added to the water as you mix it in, or to the already mixed slime (it’s easier to do it while mixing in the water).
Past experience told me to get the kids into swimmers and take this activity outside. It is very messy. Afterwards I can hose the kids down, hose out the tubs and hose the mess from the grass too. Luckily it was really hot so we enjoyed playing with the hose once we were finished with the slime.
Previously we have used various plastic animals, cups, scoops, spoons, tongs and funnels with the slime, but the kids have just as much fun without any extra play items. It is a fascinating substance that keeps the kids entertained for ages. It is lots of fun to scoop up in our hands, squish it between our fingers, and let it ooze back into the tub. We talked about its liquid and solid properties and looked at ways of changing the pressure on the slime to cause it to solidify or to liquify. The kids tried pressing it quickly or letting their hands slide into it. And of course, eventually one of them stood in it, and then sat in it. Baby T was particularly pleased with the way it squelched up between his toes.