23 :Slime with a twist

Equipment

Apparatus

• Saftefy glasses

• Beaker (100 cm3)

• Measuring cylinder (50 cm3)

• Disposable plastic cup

• wooden spatula

• Petri dish (or watch glass)

• Water-based felt-tipped pen

• Spirit-based felt-tipped pen

• Disposable plastic gloves

Chemicals

• PVA, polyvinyl alcohol, 4% (or 8%) aqueous solution, 40 cm3 (see note 3 below)

Or just use glue as it is 

• Borax, hydrated sodium tetraborate, 4% (or 8%) aqueous solution, 10 cm3

• Food colour or fluorescein (optional)

• Hydrochloric acid, about 0.5 M, 20 cm3 (optional)

• Sodium hydroxide, 0.4 M (IRRITANT), 20 cm3 (optional)