This is a great effect but I deducted 1 star because I think it makes more sense to spend a little
extra to get John Archer's "Further Education" DVD set. It's not that much more than this single
effect and includes some other fine effects in addition to this one. The 2-DVD set doesn't include
the envelopes, but you can find them online. Also, the DVD set includes a PDF with detailed
instructions on how to prepare everything for "Blank Night."