If they put this in their mouths they tend to spit it out rather than swallow it as it tastes so foul (resists a [snurk]). They will then put some more in of course...
I can't believe you used G&B cocoa! Wnakey Playdough
Top Tip - if you're making 2 colours, make 2 colours that'll mix up nicely. I made red and yellow for playgroup which meant I ended up with a nice orange once they'd mixed the 2 together. I then gave it to the nursery attached to the school because there's no way I could use 2 full batches of playdough!
Did the gltter stay in the glittery dough??