it was called space dust, it was yummy, and we used to give it to the dog - it was also reputed to cause brain damage if you put the whole packet in your mouth at once by the boy in my class who only had one eyebrow
just wanted to clarify for legal reasons that the boy with one eyebrow had only one eyebrow BEFORE he ate the space dust and in no way was it related to the eating of the space dust.
It was rumoured when I was little that if you put a whole packet in your mouth then had a big gulp of coke that you would die.....or something like that!!