This is simply a bad effect. In concept, being able to show a box of crayons, cover it for just a
second, and have them ALL vanish sounds fantastic.
However, this just has too many cons
about it.
Pros:
-Effective in the VERY right conditions.
Cons:
-VERY loud and when they vanish, EVERYONE will know.
-MUST be covered for the vanish to
work.
-SUPER cheap quality.
-100% NOT worth 10 dollars, as you can make one for
less than 1$.
I really, really, REALLY don't recommend this effect and there is a
reason why Penguin doesn't either.