You will need
- Toy plastic dinosaurs, seashells and plastic gems (you could also use other toys, such as plastic coins and plastic figures)
- 380g plain flour
- 190g rock salt
- 190g leftover dry coffee grounds
- 350ml cold water
- 1 ½ tbsp black poster paint
- Silver glitter
- PVA glue and paint brush
- Wooden spoon
- Large mixing bowl
- Chopping board
- Oven gloves
- Baking tray and wire cooling rack
- Toy hammer and toy chisel (optional)
Makes six rocks. Make sure children are supervised by an adult when doing this activity.
In a large bowl, mix together the plain flour, rock salt and coffee grounds with a wooden spoon.
Then, mix the poster paint in with the water and slowly add it to the dry ingredients while mixing to form a loose dough.
Divide the mixture into six parts and roll each one into an egg shape. The mixture makes six rocks, but you can halve the quantities to make three, or double to make 12.
Gently press a small toy into each egg shape (we’ve used a seashell, a toy dinosaur and a plastic gem).
Ensure each toy is roughly in the centre, then push the dough over the top so it’s fully encased with no cracks.
Place the rocks on a non-stick oven tray and bake in an oven for two hours at 160℃ in a fan oven or 180℃ in a conventional oven – perfect if you already have the oven on for cooking your dinner.
You can also air-dry the rocks for a couple of days until solid.
Using oven gloves, remove the baking tray from the oven and place the rocks onto a wire rack to cool down.
Tip: If you have small children, gently crack open the rocks when they are slightly warm, then push them back together again – doing it at this stage will make it easier for young kids to break open.
Once the rocks are completely cool, brush them with PVA glue and coat in silver glitter.
Now for the fun part – let your budding archaeologists chip away at the rocks using a toy hammer and chisel or on the ground in the garden, to discover what treasures are hidden inside.
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