His Majesty the King in 1999 discovered a new technique to increase cloud density at both upper and lower levels simultaneously to increase the amount and extent of rainfall. The royal rainmaking team tried out the new technique and it proved to be a very efficient way of inducing rain. He named the new cloud-seeding technique "Super Sandwich." As a joke, he sent rainmaking staff at the Bureau of Royal Rainmaking and Agricultural Aviation a photo of two round sandwiches taken by him, saying "Here is the Super Sandwich." More new techniques are being discovered and introduced to the people involved. His Majesty's ingenuity for inventing the rainmaking technology has been widely recognized and has made Thailand the center of tropical rainmaking activities in this region. He has applied modern technology to existing resources to improve rainmaking potential. Non-toxic and environment-friendly chemicals, devised by His Majesty, are used to stimulate the air mass upwind of the target area to rise and form rain clouds.