Coin Production Silk - Deluxe Version - Great Pocket Magic Trick!

Magician displays a silk. He picks up a clear glass tumbler and covers it with the silk. He then grasps all four loose corners hanging below the bottom of the glass tightly, so the empty glass rests on his closed fist covered by the silk from all sides.
The performer then produces a silver coin from the air, shows it to the audience, and throws it into the air. Spectators hear a clinking sound inside the glass tumbler.
Likewise the performer produces four coins, one by one, and tosses them into the air, catching them in the sealed tumbler. 
Magician then takes off the silk and pours out the four coins from the glass. This is the bare bones of the effect.
This silk is an utility prop. Many other interesting effects can be produced with it.
To Vanish A Marked Coin : Borrow a coin and get it marked. Place it under the silk and let a spectator hold it. Now holding the corner tell the spectator to drop the coin. The coin has vanished. Produce the marked coin from any place you wish.
Copper & Silver Transformation : Show a Silver coin. Hold it at your fingertips. Cover the coin with the silk.  Request your spectator to feel the coin. After that hold the corner and lift it slowly. The silver coin has changed to a copper one. Then change it back to a silver one, and back again, as often as you wish. This a very versatile prop, one you will find many uses for in your close up acts in various routines.

Includes one blue Coin Production Silk 13" in diameter and instructions.  You must supply any other desired prop (including coins).