Color Changing Wreathes w/ Silks

Effect : The magician shows three white wreaths and an empty paper bag. He puts a wreath in the latter and pushes a Red silk through a hole in the bag. When the wreath is pulled out, it is seen to have become Red, matching the silk. This is repeated with the other two wreaths which transforms into different colors. Now the three different colored wreaths are put inside the bag and all the three silks are pushed through the bole. When the wreaths are taken out, it is seen that nothing has happened. Suddenly, he throws the wreaths into the air where it instantly changes into a large tricolored wreath.