Four Colour Chinese Coins by J.C Magic

There is 1 red chinese coins in the magician's hand.Suddenly the red coin turns into a yellow coin!That is amazing!Then the magician holds 2 red chinese coins in his hand,after a second,one of the red coins turns into a yellow coin! After a while,the magician takes 4 chinese coins in 4 colours(red,yellow,blue and black) on the table with a deck besides him,all of a sudden,there are only 3 coins(red,black and blue) left on the table,where is the yellow coin?The yellow coin goes into the bottom of the deck!WOW!Unbelieveable!At last,the magician holds 4 coins in his hand,several seconds later,the coins of red ,black,blue and yellow disappears one by one!Nothing is left finally!