How do I collect used stamps ?

How do I collect used stamps ?

Do not  throw away letters that you receive. You can collect used up stamps through them. These can be detached delicately from the postal articles.   Rinse   in   a   shallow dish of water, using your hands or a soft brush.   Carefully   dry   them  in a dark place as  the ultra violet rays of sunlight can damage the colours.  It is also   valuable   to   retain  stamps   along with the envelopes on which they are pasted as this authenticates their use.