Edible cake glitter is colored, dried gum arabic.
It comes in small flakes, can be ground thru a tea strainer to make it finer, and it's water soluble. I've had luck getting it to stick by spraying something with vodka or Everclear, uncrusted fresh buttercream, or a light coat of piping gel.
Wilton makes edible cake glitter (Cake Sparkles) and it can be found at most cake deco stores and online.
http://www.thebakerskitchen.net/edible_glitter.aspx
Disco dust is NOT edible. It's fine grain plastic glitter and should be used only on things that won't be eaten or be removed before consumption.
Rae
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