when the public thinks it knows where the glass is hidden

the credit card disappears

with the performer writing those colors on the envelopes while the participant watches and sees the words being written

The magician picks it up and pours water from it

It's A Card At Any Number

Gehorsame Tücher Card Shark when the public thinks itThree different colored silk scarves are knotted on a silk ribbon. They ask a spectator to call out one of the silk scarves. For example, they call out "The Red." And lo and beholdas if by magicthe red scarf unties itself and pops off the ribbon. This can be repeated immediately with the second color mentioned!