Silly Putty:

Question:

We have been trying to make silly putty. We have some recipes but have not been very successful.
Does anyone have a tried and true recipe which will produce stretchy and/or bouncy putty?

Answer:

METHOD 1:
25 ml Craft-Tec PVA glue (from Emtex Handcrafts/School Mart 9 Sevenoaks St Bentley phone 9356 2392 and 9356 2242) (other brands don’t work as well).
10 ml 5 percent borax solution.
Food colouring.
Pour 25 ml glue into 100 ml beaker. Add 3 drops food colouring and 10 ml water and stir.
Slowly pour borax solution to the mixture in portions, with continual stirring.
Rinse putty under running water whilst moulding it in your hands. Dry with paper towel.
Store in a plastic bag.

METHOD 2:
A MORE DIFFICULT REACTION (Suitable for Year 8s)
THE FOLLOWING CHEMICAL REACTION REQUIRES VERY CAREFUL AND ACCURATE HANDLING.
SOME OF THE CHEMICALS YOU WILL USE ARE POTENTIALLY HAZARDOUS!!
FOLLOW ALL INSTRUCTIONS VERY CAREFULLY!!
MATERIALS:
1.Collect safety glasses for all members of your group.
2.Collect the following:
1x 100 ml polyvinyl acetate (C5H8O2) (handle with extreme care) (PVA glue)
1x white plastic container (ice cream container)
1x 250ml beaker
2 ml chloronitrobromine (Food colouring)
Sodium borate (Na2B4O7.10H2O) Safety glasses must be worn- this is an eye irritant) Borax-2.5 g/ 50ml for a 5 percent solution
Very hot water-from kettle when required.
1x stirring rod
METHOD:
1.Making sure all safety precautions are in place, carefully pour the polyvinyl acetate into the empty white container.
2.Add 50 ml of tap water (use a beaker). Stir.
3.Add the chloronitrobromine. Stir until combined.
4.Let this mixture stand while you CAREFULLY place the sodium borate into the other empty beaker. Add 50 ml of very hot water, stirring with the stirring rod until completely dissolved.
5.Carefully pour this solution into the polyvinyl acetate and water mixture, stirring to combine.
Note: students should still wash hands after playing with this putty.
AT THIS POINT, ASK YOUR TEACHER FOR THE FINAL SHEET OF INSTRUCTIONS
PAGE 2:
NOW THAT YOU HAVE WORKED AS SENSIBLE, RESPONSIBLE CHEMISTS, ITS TIME TO PUT AWAY YOUR SAFETY GLASSES!!
WITH COMPLETELY UNPROTECTED HANDS, KNEAD AND MIX YOUR REACTION UNTIL IT RESEMBLES SOMETHING THAT YOU MAY HAVE PLAYED WITH IN YOUR YOUNGER YEARS!!
HAVE FUN!!

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