Science, why hast thou forsaken me? Help me work out why my PVA slime isn't slimy.
School holiday time. Thinking of neat science-y things to do with my seven-year old niece. Slime seemed to be the obvious choice. The recipes online all seem much the same - a 50/50 solution of white PVA glue and some borax solution, combine the two solutions, voila, slime.
The first batch was made according to these instructions
. I combined both mixtures and waited. There was a turbulent cloudy effect, after which every drop of food colouring I added to the glue solution was ejected. I was left with a strange white putty they yields to gentle pressure but instantly shears or snaps if you try to stretch it.
Some more googling suggested that adding too much borax solution would cause 'cross linking' in the polymer and create hard putty. Using these instructions
, I added the borax solution a teaspoon at a time to a half-cup of glue solution. Nothing. Nothing. Nothing. Then suddenly, the same fleeing of the food dye and the same goddamned putty in the bottom of the bowl.
Is it the glue? It's just white PVA wood glue. Help me, science geeks!